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Merge pull request #12 from go-jet/window-functions

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Window functions
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go-jet 2019-09-17 13:50:31 +02:00 • committed by GitHub
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13
README.md
View file

@ -12,9 +12,12 @@ convert database query result into desired arbitrary object structure.
Jet currently supports `PostgreSQL`, `MySQL` and `MariaDB`. Future releases will add support for additional databases.
![jet](https://github.com/go-jet/jet/wiki/image/jet.png)
Jet is the easiest and fastest way to write complex SQL queries and map database query result
Jet is the easiest and the fastest way to write complex SQL queries and map database query result
into complex object composition. __It is not an ORM.__
## Motivation
https://medium.com/@go.jet/jet-5f3667efa0cc
## Contents
- [Features](#features)
- [Getting Started](#getting-started)
@ -265,7 +268,7 @@ ORDER BY actor.actor_id ASC, film.film_id ASC;
#### Execute query and store result
Well formed SQL is just a first half the job. Lets see how can we make some sense of result set returned executing
Well formed SQL is just a first half of the job. Lets see how can we make some sense of result set returned executing
above statement. Usually this is the most complex and tedious work, but with Jet it is the easiest.
First we have to create desired structure to store query result set.
@ -491,8 +494,8 @@ handleError(err)
Complete code example can be found at [./examples/quick-start/quick-start.go](./examples/quick-start/quick-start.go)
This example represent probably the most common use case. Detail info about additional features and use cases can be
found at project [wiki](https://github.com/go-jet/jet/wiki) page.
This example represent probably the most common use case. Detail info about additional statements, features and use cases can be
found at project [Wiki](https://github.com/go-jet/jet/wiki) page.
## Benefits
@ -536,6 +539,8 @@ the bug will be caught at compile time.
Lets say someone changes the type of `length` column to some non integer type. Build will also fail at the same line
because integer columns and expressions can be only compered to other integer columns and expressions.
Build will also fail if someone removes `length` column from `film` table, because `Film` field will be omitted from SQL Builder and Model types, next time `jet` generator is run.
Without Jet these bugs will have to be either caught by some test or by manual testing.
## Dependencies

41
internal/jet/clause.go
View file

@ -134,7 +134,8 @@ func (c *ClauseHaving) Serialize(statementType StatementType, out *SQLBuilder) {
// ClauseOrderBy struct
type ClauseOrderBy struct {
List []OrderByClause
List []OrderByClause
SkipNewLine bool
}
// Serialize serializes clause into SQLBuilder
@ -143,7 +144,9 @@ func (o *ClauseOrderBy) Serialize(statementType StatementType, out *SQLBuilder)
return
}
out.NewLine()
if !o.SkipNewLine {
out.NewLine()
}
out.WriteString("ORDER BY")
out.IncreaseIdent()
@ -469,3 +472,37 @@ func (i *ClauseIn) Serialize(statementType StatementType, out *SQLBuilder) {
out.WriteString(string(i.LockMode))
out.WriteString("MODE")
}
// WindowDefinition struct
type WindowDefinition struct {
Name string
Window Window
}
// ClauseWindow struct
type ClauseWindow struct {
Definitions []WindowDefinition
}
// Serialize serializes clause into SQLBuilder
func (i *ClauseWindow) Serialize(statementType StatementType, out *SQLBuilder) {
if len(i.Definitions) == 0 {
return
}
out.NewLine()
out.WriteString("WINDOW")
for i, def := range i.Definitions {
if i > 0 {
out.WriteString(", ")
}
out.WriteString(def.Name)
out.WriteString("AS")
if def.Window == nil {
out.WriteString("()")
continue
}
def.Window.serialize(statementType, out)
}
}

195
internal/jet/func_expression.go
View file

@ -81,68 +81,154 @@ func LOG(floatExpression FloatExpression) FloatExpression {
// ----------------- Aggregate functions -------------------//
// AVG is aggregate function used to calculate avg value from numeric expression
func AVG(numericExpression NumericExpression) FloatExpression {
return NewFloatFunc("AVG", numericExpression)
func AVG(numericExpression NumericExpression) floatWindowExpression {
return NewFloatWindowFunc("AVG", numericExpression)
}
// BIT_AND is aggregate function used to calculates the bitwise AND of all non-null input values, or null if none.
func BIT_AND(integerExpression IntegerExpression) IntegerExpression {
return newIntegerFunc("BIT_AND", integerExpression)
func BIT_AND(integerExpression IntegerExpression) integerWindowExpression {
return newIntegerWindowFunc("BIT_AND", integerExpression)
}
// BIT_OR is aggregate function used to calculates the bitwise OR of all non-null input values, or null if none.
func BIT_OR(integerExpression IntegerExpression) IntegerExpression {
return newIntegerFunc("BIT_OR", integerExpression)
func BIT_OR(integerExpression IntegerExpression) integerWindowExpression {
return newIntegerWindowFunc("BIT_OR", integerExpression)
}
// BOOL_AND is aggregate function. Returns true if all input values are true, otherwise false
func BOOL_AND(boolExpression BoolExpression) BoolExpression {
return newBoolFunc("BOOL_AND", boolExpression)
func BOOL_AND(boolExpression BoolExpression) boolWindowExpression {
return newBoolWindowFunc("BOOL_AND", boolExpression)
}
// BOOL_OR is aggregate function. Returns true if at least one input value is true, otherwise false
func BOOL_OR(boolExpression BoolExpression) BoolExpression {
return newBoolFunc("BOOL_OR", boolExpression)
func BOOL_OR(boolExpression BoolExpression) boolWindowExpression {
return newBoolWindowFunc("BOOL_OR", boolExpression)
}
// COUNT is aggregate function. Returns number of input rows for which the value of expression is not null.
func COUNT(expression Expression) IntegerExpression {
return newIntegerFunc("COUNT", expression)
func COUNT(expression Expression) integerWindowExpression {
return newIntegerWindowFunc("COUNT", expression)
}
// EVERY is aggregate function. Returns true if all input values are true, otherwise false
func EVERY(boolExpression BoolExpression) BoolExpression {
return newBoolFunc("EVERY", boolExpression)
func EVERY(boolExpression BoolExpression) boolWindowExpression {
return newBoolWindowFunc("EVERY", boolExpression)
}
// MAXf is aggregate function. Returns maximum value of float expression across all input values
func MAXf(floatExpression FloatExpression) FloatExpression {
return NewFloatFunc("MAX", floatExpression)
func MAXf(floatExpression FloatExpression) floatWindowExpression {
return NewFloatWindowFunc("MAX", floatExpression)
}
// MAXi is aggregate function. Returns maximum value of int expression across all input values
func MAXi(integerExpression IntegerExpression) IntegerExpression {
return newIntegerFunc("MAX", integerExpression)
func MAXi(integerExpression IntegerExpression) integerWindowExpression {
return newIntegerWindowFunc("MAX", integerExpression)
}
// MINf is aggregate function. Returns minimum value of float expression across all input values
func MINf(floatExpression FloatExpression) FloatExpression {
return NewFloatFunc("MIN", floatExpression)
func MINf(floatExpression FloatExpression) floatWindowExpression {
return NewFloatWindowFunc("MIN", floatExpression)
}
// MINi is aggregate function. Returns minimum value of int expression across all input values
func MINi(integerExpression IntegerExpression) IntegerExpression {
return newIntegerFunc("MIN", integerExpression)
func MINi(integerExpression IntegerExpression) integerWindowExpression {
return newIntegerWindowFunc("MIN", integerExpression)
}
// SUMf is aggregate function. Returns sum of expression across all float expressions
func SUMf(floatExpression FloatExpression) FloatExpression {
return NewFloatFunc("SUM", floatExpression)
func SUMf(floatExpression FloatExpression) floatWindowExpression {
return NewFloatWindowFunc("SUM", floatExpression)
}
// SUMi is aggregate function. Returns sum of expression across all integer expression.
func SUMi(integerExpression IntegerExpression) IntegerExpression {
return newIntegerFunc("SUM", integerExpression)
func SUMi(integerExpression IntegerExpression) integerWindowExpression {
return newIntegerWindowFunc("SUM", integerExpression)
}
// ----------------- Window functions -------------------//
// ROW_NUMBER returns number of the current row within its partition, counting from 1
func ROW_NUMBER() integerWindowExpression {
return newIntegerWindowFunc("ROW_NUMBER")
}
// RANK of the current row with gaps; same as row_number of its first peer
func RANK() integerWindowExpression {
return newIntegerWindowFunc("RANK")
}
// DENSE_RANK returns rank of the current row without gaps; this function counts peer groups
func DENSE_RANK() integerWindowExpression {
return newIntegerWindowFunc("DENSE_RANK")
}
// PERCENT_RANK calculates relative rank of the current row: (rank - 1) / (total partition rows - 1)
func PERCENT_RANK() floatWindowExpression {
return NewFloatWindowFunc("PERCENT_RANK")
}
// CUME_DIST calculates cumulative distribution: (number of partition rows preceding or peer with current row) / total partition rows
func CUME_DIST() floatWindowExpression {
return NewFloatWindowFunc("CUME_DIST")
}
// NTILE returns integer ranging from 1 to the argument value, dividing the partition as equally as possible
func NTILE(numOfBuckets int64) integerWindowExpression {
return newIntegerWindowFunc("NTILE", FixedLiteral(numOfBuckets))
}
// LAG returns value evaluated at the row that is offset rows before the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
func LAG(expr Expression, offsetAndDefault ...interface{}) windowExpression {
return leadLagImpl("LAG", expr, offsetAndDefault...)
}
// LEAD returns value evaluated at the row that is offset rows after the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
func LEAD(expr Expression, offsetAndDefault ...interface{}) windowExpression {
return leadLagImpl("LEAD", expr, offsetAndDefault...)
}
// FIRST_VALUE returns value evaluated at the row that is the first row of the window frame
func FIRST_VALUE(value Expression) windowExpression {
return newWindowFunc("FIRST_VALUE", value)
}
// LAST_VALUE returns value evaluated at the row that is the last row of the window frame
func LAST_VALUE(value Expression) windowExpression {
return newWindowFunc("LAST_VALUE", value)
}
// NTH_VALUE returns value evaluated at the row that is the nth row of the window frame (counting from 1); null if no such row
func NTH_VALUE(value Expression, nth int64) windowExpression {
return newWindowFunc("NTH_VALUE", value, FixedLiteral(nth))
}
func leadLagImpl(name string, expr Expression, offsetAndDefault ...interface{}) windowExpression {
params := []Expression{expr}
if len(offsetAndDefault) >= 2 {
offset, ok := offsetAndDefault[0].(int)
if !ok {
panic("jet: LAG offset should be an integer")
}
var defaultValue Expression
defaultValue, ok = offsetAndDefault[1].(Expression)
if !ok {
defaultValue = literal(offsetAndDefault[1])
}
params = append(params, FixedLiteral(offset), defaultValue)
}
return newWindowFunc(name, params...)
}
//------------ String functions ------------------//
@ -349,7 +435,7 @@ func TO_HEX(number IntegerExpression) StringExpression {
// REGEXP_LIKE Returns 1 if the string expr matches the regular expression specified by the pattern pat, 0 otherwise.
func REGEXP_LIKE(stringExp StringExpression, pattern StringExpression, matchType ...string) BoolExpression {
if len(matchType) > 0 {
return newBoolFunc("REGEXP_LIKE", stringExp, pattern, ConstLiteral(matchType[0]))
return newBoolFunc("REGEXP_LIKE", stringExp, pattern, FixedLiteral(matchType[0]))
}
return newBoolFunc("REGEXP_LIKE", stringExp, pattern)
@ -391,7 +477,7 @@ func CURRENT_TIME(precision ...int) TimezExpression {
var timezFunc *timezFunc
if len(precision) > 0 {
timezFunc = newTimezFunc("CURRENT_TIME", ConstLiteral(precision[0]))
timezFunc = newTimezFunc("CURRENT_TIME", FixedLiteral(precision[0]))
} else {
timezFunc = newTimezFunc("CURRENT_TIME")
}
@ -406,7 +492,7 @@ func CURRENT_TIMESTAMP(precision ...int) TimestampzExpression {
var timestampzFunc *timestampzFunc
if len(precision) > 0 {
timestampzFunc = newTimestampzFunc("CURRENT_TIMESTAMP", ConstLiteral(precision[0]))
timestampzFunc = newTimestampzFunc("CURRENT_TIMESTAMP", FixedLiteral(precision[0]))
} else {
timestampzFunc = newTimestampzFunc("CURRENT_TIMESTAMP")
}
@ -421,7 +507,7 @@ func LOCALTIME(precision ...int) TimeExpression {
var timeFunc *timeFunc
if len(precision) > 0 {
timeFunc = newTimeFunc("LOCALTIME", ConstLiteral(precision[0]))
timeFunc = newTimeFunc("LOCALTIME", FixedLiteral(precision[0]))
} else {
timeFunc = newTimeFunc("LOCALTIME")
}
@ -436,7 +522,7 @@ func LOCALTIMESTAMP(precision ...int) TimestampExpression {
var timestampFunc *timestampFunc
if len(precision) > 0 {
timestampFunc = NewTimestampFunc("LOCALTIMESTAMP", ConstLiteral(precision[0]))
timestampFunc = NewTimestampFunc("LOCALTIMESTAMP", FixedLiteral(precision[0]))
} else {
timestampFunc = NewTimestampFunc("LOCALTIMESTAMP")
}
@ -504,6 +590,16 @@ func newFunc(name string, expressions []Expression, parent Expression) *funcExpr
return funcExp
}
// NewFloatWindowFunc creates new float function with name and expressions
func newWindowFunc(name string, expressions ...Expression) windowExpression {
newFun := newFunc(name, expressions, nil)
windowExpr := newWindowExpression(newFun)
newFun.expressionInterfaceImpl.Parent = windowExpr
return windowExpr
}
func (f *funcExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
if serializeOverride := out.Dialect.FunctionSerializeOverride(f.name); serializeOverride != nil {
serializeOverrideFunc := serializeOverride(f.expressions...)
@ -536,10 +632,23 @@ func newBoolFunc(name string, expressions ...Expression) BoolExpression {
boolFunc.funcExpressionImpl = *newFunc(name, expressions, boolFunc)
boolFunc.boolInterfaceImpl.parent = boolFunc
boolFunc.expressionInterfaceImpl.Parent = boolFunc
return boolFunc
}
// NewFloatWindowFunc creates new float function with name and expressions
func newBoolWindowFunc(name string, expressions ...Expression) boolWindowExpression {
boolFunc := &boolFunc{}
boolFunc.funcExpressionImpl = *newFunc(name, expressions, boolFunc)
intWindowFunc := newBoolWindowExpression(boolFunc)
boolFunc.boolInterfaceImpl.parent = intWindowFunc
boolFunc.expressionInterfaceImpl.Parent = intWindowFunc
return intWindowFunc
}
type floatFunc struct {
funcExpressionImpl
floatInterfaceImpl
@ -555,6 +664,18 @@ func NewFloatFunc(name string, expressions ...Expression) FloatExpression {
return floatFunc
}
// NewFloatWindowFunc creates new float function with name and expressions
func NewFloatWindowFunc(name string, expressions ...Expression) floatWindowExpression {
floatFunc := &floatFunc{}
floatFunc.funcExpressionImpl = *newFunc(name, expressions, floatFunc)
floatWindowFunc := newFloatWindowExpression(floatFunc)
floatFunc.floatInterfaceImpl.parent = floatWindowFunc
floatFunc.expressionInterfaceImpl.Parent = floatWindowFunc
return floatWindowFunc
}
type integerFunc struct {
funcExpressionImpl
integerInterfaceImpl
@ -569,6 +690,18 @@ func newIntegerFunc(name string, expressions ...Expression) IntegerExpression {
return floatFunc
}
// NewFloatWindowFunc creates new float function with name and expressions
func newIntegerWindowFunc(name string, expressions ...Expression) integerWindowExpression {
integerFunc := &integerFunc{}
integerFunc.funcExpressionImpl = *newFunc(name, expressions, integerFunc)
intWindowFunc := newIntegerWindowExpression(integerFunc)
integerFunc.integerInterfaceImpl.parent = intWindowFunc
integerFunc.expressionInterfaceImpl.Parent = intWindowFunc
return intWindowFunc
}
type stringFunc struct {
funcExpressionImpl
stringInterfaceImpl

4
internal/jet/literal_expression.go
View file

@ -32,8 +32,8 @@ func literal(value interface{}, optionalConstant ...bool) *literalExpressionImpl
return &exp
}
// ConstLiteral is injected directly to SQL query, and does not appear in argument list.
func ConstLiteral(value interface{}) *literalExpressionImpl {
// FixedLiteral is injected directly to SQL query, and does not appear in parametrized argument list.
func FixedLiteral(value interface{}) *literalExpressionImpl {
exp := literal(value)
exp.constant = true

146
internal/jet/window_expression.go Normal file
View file

@ -0,0 +1,146 @@
package jet
type commonWindowImpl struct {
expression Expression
window Window
}
func (w *commonWindowImpl) over(window ...Window) {
if len(window) > 0 {
w.window = window[0]
} else {
w.window = newWindowImpl(nil)
}
}
func (w *commonWindowImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
w.expression.serialize(statement, out)
if w.window != nil {
out.WriteString("OVER")
w.window.serialize(statement, out)
}
}
// --------------------------------------
type windowExpression interface {
Expression
OVER(window ...Window) Expression
}
func newWindowExpression(Exp Expression) windowExpression {
newExp := &windowExpressionImpl{
Expression: Exp,
}
newExp.commonWindowImpl.expression = Exp
return newExp
}
type windowExpressionImpl struct {
Expression
commonWindowImpl
}
func (f *windowExpressionImpl) OVER(window ...Window) Expression {
f.commonWindowImpl.over(window...)
return f
}
func (f *windowExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
f.commonWindowImpl.serialize(statement, out)
}
// -----------------------------------------------------
type floatWindowExpression interface {
FloatExpression
OVER(window ...Window) FloatExpression
}
func newFloatWindowExpression(floatExp FloatExpression) floatWindowExpression {
newExp := &floatWindowExpressionImpl{
FloatExpression: floatExp,
}
newExp.commonWindowImpl.expression = floatExp
return newExp
}
type floatWindowExpressionImpl struct {
FloatExpression
commonWindowImpl
}
func (f *floatWindowExpressionImpl) OVER(window ...Window) FloatExpression {
f.commonWindowImpl.over(window...)
return f
}
func (f *floatWindowExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
f.commonWindowImpl.serialize(statement, out)
}
// ------------------------------------------------
type integerWindowExpression interface {
IntegerExpression
OVER(window ...Window) IntegerExpression
}
func newIntegerWindowExpression(intExp IntegerExpression) integerWindowExpression {
newExp := &integerWindowExpressionImpl{
IntegerExpression: intExp,
}
newExp.commonWindowImpl.expression = intExp
return newExp
}
type integerWindowExpressionImpl struct {
IntegerExpression
commonWindowImpl
}
func (f *integerWindowExpressionImpl) OVER(window ...Window) IntegerExpression {
f.commonWindowImpl.over(window...)
return f
}
func (f *integerWindowExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
f.commonWindowImpl.serialize(statement, out)
}
// ------------------------------------------------
type boolWindowExpression interface {
BoolExpression
OVER(window ...Window) BoolExpression
}
func newBoolWindowExpression(boolExp BoolExpression) boolWindowExpression {
newExp := &boolWindowExpressionImpl{
BoolExpression: boolExp,
}
newExp.commonWindowImpl.expression = boolExp
return newExp
}
type boolWindowExpressionImpl struct {
BoolExpression
commonWindowImpl
}
func (f *boolWindowExpressionImpl) OVER(window ...Window) BoolExpression {
f.commonWindowImpl.over(window...)
return f
}
func (f *boolWindowExpressionImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
f.commonWindowImpl.serialize(statement, out)
}

186
internal/jet/window_func.go Normal file
View file

@ -0,0 +1,186 @@
package jet
// Window interface
type Window interface {
Serializer
ORDER_BY(expr ...OrderByClause) Window
ROWS(start FrameExtent, end ...FrameExtent) Window
RANGE(start FrameExtent, end ...FrameExtent) Window
GROUPS(start FrameExtent, end ...FrameExtent) Window
}
type windowImpl struct {
partitionBy []Expression
orderBy ClauseOrderBy
frameUnits string
start, end FrameExtent
parent Window
}
func newWindowImpl(parent Window) *windowImpl {
newWindow := &windowImpl{}
if parent == nil {
newWindow.parent = newWindow
} else {
newWindow.parent = parent
}
return newWindow
}
func (w *windowImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
if !contains(options, noWrap) {
out.WriteByte('(')
}
if w.partitionBy != nil {
out.WriteString("PARTITION BY")
serializeExpressionList(statement, w.partitionBy, ", ", out)
}
w.orderBy.SkipNewLine = true
w.orderBy.Serialize(statement, out)
if w.frameUnits != "" {
out.WriteString(w.frameUnits)
if w.end == nil {
w.start.serialize(statement, out)
} else {
out.WriteString("BETWEEN")
w.start.serialize(statement, out)
out.WriteString("AND")
w.end.serialize(statement, out)
}
}
if !contains(options, noWrap) {
out.WriteByte(')')
}
}
func (w *windowImpl) ORDER_BY(exprs ...OrderByClause) Window {
w.orderBy.List = exprs
return w.parent
}
func (w *windowImpl) ROWS(start FrameExtent, end ...FrameExtent) Window {
w.frameUnits = "ROWS"
w.setFrameRange(start, end...)
return w.parent
}
func (w *windowImpl) RANGE(start FrameExtent, end ...FrameExtent) Window {
w.frameUnits = "RANGE"
w.setFrameRange(start, end...)
return w.parent
}
func (w *windowImpl) GROUPS(start FrameExtent, end ...FrameExtent) Window {
w.frameUnits = "GROUPS"
w.setFrameRange(start, end...)
return w.parent
}
func (w *windowImpl) setFrameRange(start FrameExtent, end ...FrameExtent) {
w.start = start
if len(end) > 0 {
w.end = end[0]
}
}
// PARTITION_BY window function constructor
func PARTITION_BY(exp Expression, exprs ...Expression) Window {
funImpl := newWindowImpl(nil)
funImpl.partitionBy = append([]Expression{exp}, exprs...)
return funImpl
}
// ORDER_BY window function constructor
func ORDER_BY(expr ...OrderByClause) Window {
funImpl := newWindowImpl(nil)
funImpl.orderBy.List = expr
return funImpl
}
// -----------------------------------------------
// FrameExtent interface
type FrameExtent interface {
Serializer
isFrameExtent()
}
// PRECEDING window frame clause
func PRECEDING(offset Serializer) FrameExtent {
return &frameExtentImpl{
preceding: true,
offset: offset,
}
}
// FOLLOWING window frame clause
func FOLLOWING(offset Serializer) FrameExtent {
return &frameExtentImpl{
preceding: false,
offset: offset,
}
}
type frameExtentImpl struct {
preceding bool
offset Serializer
}
func (f *frameExtentImpl) isFrameExtent() {}
func (f *frameExtentImpl) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
if f == nil {
return
}
f.offset.serialize(statement, out)
if f.preceding {
out.WriteString("PRECEDING")
} else {
out.WriteString("FOLLOWING")
}
}
// -----------------------------------------------
// Window function keywords
var (
UNBOUNDED = keywordClause("UNBOUNDED")
CURRENT_ROW = frameExtentKeyword{"CURRENT ROW"}
)
type frameExtentKeyword struct {
keywordClause
}
func (f frameExtentKeyword) isFrameExtent() {}
// -----------------------------------------------
// WindowName is used to specify window reference from WINDOW clause
func WindowName(name string) Window {
newWindow := &windowName{name: name}
newWindow.parent = newWindow
return newWindow
}
type windowName struct {
windowImpl
name string
}
func (w windowName) serialize(statement StatementType, out *SQLBuilder, options ...SerializeOption) {
out.WriteByte('(')
out.WriteString(w.name)
w.windowImpl.serialize(statement, out, noWrap)
out.WriteByte(')')
}

21
internal/jet/window_func_test.go Normal file
View file

@ -0,0 +1,21 @@
package jet
import "testing"
func TestFrameExtent(t *testing.T) {
assertClauseSerialize(t, PRECEDING(Int(2)), "$1 PRECEDING", int64(2))
assertClauseSerialize(t, FOLLOWING(Int(4)), "$1 FOLLOWING", int64(4))
}
func TestWindowFunctions(t *testing.T) {
assertClauseSerialize(t, PARTITION_BY(table1Col1), "(PARTITION BY table1.col1)")
assertClauseSerialize(t, PARTITION_BY(table1Col3).ORDER_BY(table1Col1), "(PARTITION BY table1.col3 ORDER BY table1.col1)")
assertClauseSerialize(t, ORDER_BY(table1Col1), "(ORDER BY table1.col1)")
assertClauseSerialize(t, ORDER_BY(table1Col1).ROWS(PRECEDING(Int(1))), "(ORDER BY table1.col1 ROWS $1 PRECEDING)", int64(1))
assertClauseSerialize(t, ORDER_BY(table1Col1).ROWS(PRECEDING(Int(1)), FOLLOWING(Int(33))),
"(ORDER BY table1.col1 ROWS BETWEEN $1 PRECEDING AND $2 FOLLOWING)", int64(1), int64(33))
assertClauseSerialize(t, ORDER_BY(table1Col1).RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED)),
"(ORDER BY table1.col1 RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)")
assertClauseSerialize(t, ORDER_BY(table1Col1).RANGE(PRECEDING(UNBOUNDED), CURRENT_ROW),
"(ORDER BY table1.col1 RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)")
}

43
mysql/functions.go
View file

@ -85,6 +85,47 @@ var SUMi = jet.SUMi
// SUMf is aggregate function. Returns sum of float expression.
var SUMf = jet.SUMf
// -------------------- Window functions -----------------------//
// ROW_NUMBER returns number of the current row within its partition, counting from 1
var ROW_NUMBER = jet.ROW_NUMBER
// RANK of the current row with gaps; same as row_number of its first peer
var RANK = jet.RANK
// DENSE_RANK returns rank of the current row without gaps; this function counts peer groups
var DENSE_RANK = jet.DENSE_RANK
// PERCENT_RANK calculates relative rank of the current row: (rank - 1) / (total partition rows - 1)
var PERCENT_RANK = jet.PERCENT_RANK
// CUME_DIST calculates cumulative distribution: (number of partition rows preceding or peer with current row) / total partition rows
var CUME_DIST = jet.CUME_DIST
// NTILE returns integer ranging from 1 to the argument value, dividing the partition as equally as possible
var NTILE = jet.NTILE
// LAG returns value evaluated at the row that is offset rows before the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
var LAG = jet.LAG
// LEAD returns value evaluated at the row that is offset rows after the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
var LEAD = jet.LEAD
// FIRST_VALUE returns value evaluated at the row that is the first row of the window frame
var FIRST_VALUE = jet.FIRST_VALUE
// LAST_VALUE returns value evaluated at the row that is the last row of the window frame
var LAST_VALUE = jet.LAST_VALUE
// NTH_VALUE returns value evaluated at the row that is the nth row of the window frame (counting from 1); null if no such row
var NTH_VALUE = jet.NTH_VALUE
//--------------------- String functions ------------------//
// BIT_LENGTH returns number of bits in string expression
@ -181,7 +222,7 @@ func CURRENT_TIMESTAMP(precision ...int) TimestampExpression {
// NOW returns current datetime
func NOW(fsp ...int) DateTimeExpression {
if len(fsp) > 0 {
return jet.NewTimestampFunc("NOW", jet.ConstLiteral(int64(fsp[0])))
return jet.NewTimestampFunc("NOW", jet.FixedLiteral(int64(fsp[0])))
}
return jet.NewTimestampFunc("NOW")
}

62
mysql/select_statement.go
View file

@ -1,6 +1,8 @@
package mysql
import "github.com/go-jet/jet/internal/jet"
import (
"github.com/go-jet/jet/internal/jet"
)
// RowLock is interface for SELECT statement row lock types
type RowLock = jet.RowLock
@ -11,6 +13,27 @@ var (
SHARE = jet.NewRowLock("SHARE")
)
// Window function clauses
var (
PARTITION_BY = jet.PARTITION_BY
ORDER_BY = jet.ORDER_BY
UNBOUNDED = jet.UNBOUNDED
CURRENT_ROW = jet.CURRENT_ROW
)
// PRECEDING window frame clause
func PRECEDING(offset interface{}) jet.FrameExtent {
return jet.PRECEDING(toJetFrameOffset(offset))
}
// FOLLOWING window frame clause
func FOLLOWING(offset interface{}) jet.FrameExtent {
return jet.FOLLOWING(toJetFrameOffset(offset))
}
// Window is used to specify window reference from WINDOW clause
var Window = jet.WindowName
// SelectStatement is interface for MySQL SELECT statement
type SelectStatement interface {
Statement
@ -22,6 +45,7 @@ type SelectStatement interface {
WHERE(expression BoolExpression) SelectStatement
GROUP_BY(groupByClauses ...jet.GroupByClause) SelectStatement
HAVING(boolExpression BoolExpression) SelectStatement
WINDOW(name string) windowExpand
ORDER_BY(orderByClauses ...jet.OrderByClause) SelectStatement
LIMIT(limit int64) SelectStatement
OFFSET(offset int64) SelectStatement
@ -42,7 +66,7 @@ func SELECT(projection Projection, projections ...Projection) SelectStatement {
func newSelectStatement(table ReadableTable, projections []Projection) SelectStatement {
newSelect := &selectStatementImpl{}
newSelect.ExpressionStatement = jet.NewExpressionStatementImpl(Dialect, jet.SelectStatementType, newSelect, &newSelect.Select,
&newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.OrderBy,
&newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.Window, &newSelect.OrderBy,
&newSelect.Limit, &newSelect.Offset, &newSelect.For, &newSelect.ShareLock)
newSelect.Select.Projections = toJetProjectionList(projections)
@ -66,6 +90,7 @@ type selectStatementImpl struct {
Where jet.ClauseWhere
GroupBy jet.ClauseGroupBy
Having jet.ClauseHaving
Window jet.ClauseWindow
OrderBy jet.ClauseOrderBy
Limit jet.ClauseLimit
Offset jet.ClauseOffset
@ -98,6 +123,11 @@ func (s *selectStatementImpl) HAVING(boolExpression BoolExpression) SelectStatem
return s
}
func (s *selectStatementImpl) WINDOW(name string) windowExpand {
s.Window.Definitions = append(s.Window.Definitions, jet.WindowDefinition{Name: name})
return windowExpand{selectStatement: s}
}
func (s *selectStatementImpl) ORDER_BY(orderByClauses ...jet.OrderByClause) SelectStatement {
s.OrderBy.List = orderByClauses
return s
@ -126,3 +156,31 @@ func (s *selectStatementImpl) LOCK_IN_SHARE_MODE() SelectStatement {
func (s *selectStatementImpl) AsTable(alias string) SelectTable {
return newSelectTable(s, alias)
}
//-----------------------------------------------------
type windowExpand struct {
selectStatement *selectStatementImpl
}
func (w windowExpand) AS(window ...jet.Window) SelectStatement {
if len(window) == 0 {
return w.selectStatement
}
windowsDefinition := w.selectStatement.Window.Definitions
windowsDefinition[len(windowsDefinition)-1].Window = window[0]
return w.selectStatement
}
func toJetFrameOffset(offset interface{}) jet.Serializer {
if offset == UNBOUNDED {
return jet.UNBOUNDED
}
// check for interval expression
//if exp, ok := offset.(Expression); ok {
// return exp
//}
return jet.FixedLiteral(offset)
}

41
postgres/functions.go
View file

@ -87,6 +87,47 @@ var SUMf = jet.SUMf
// SUMi is aggregate function. Returns sum of expression across all integer expression.
var SUMi = jet.SUMi
// -------------------- Window functions -----------------------//
// ROW_NUMBER returns number of the current row within its partition, counting from 1
var ROW_NUMBER = jet.ROW_NUMBER
// RANK of the current row with gaps; same as row_number of its first peer
var RANK = jet.RANK
// DENSE_RANK returns rank of the current row without gaps; this function counts peer groups
var DENSE_RANK = jet.DENSE_RANK
// PERCENT_RANK calculates relative rank of the current row: (rank - 1) / (total partition rows - 1)
var PERCENT_RANK = jet.PERCENT_RANK
// CUME_DIST calculates cumulative distribution: (number of partition rows preceding or peer with current row) / total partition rows
var CUME_DIST = jet.CUME_DIST
// NTILE returns integer ranging from 1 to the argument value, dividing the partition as equally as possible
var NTILE = jet.NTILE
// LAG returns value evaluated at the row that is offset rows before the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
var LAG = jet.LAG
// LEAD returns value evaluated at the row that is offset rows after the current row within the partition;
// if there is no such row, instead return default (which must be of the same type as value).
// Both offset and default are evaluated with respect to the current row.
// If omitted, offset defaults to 1 and default to null
var LEAD = jet.LEAD
// FIRST_VALUE returns value evaluated at the row that is the first row of the window frame
var FIRST_VALUE = jet.FIRST_VALUE
// LAST_VALUE returns value evaluated at the row that is the last row of the window frame
var LAST_VALUE = jet.LAST_VALUE
// NTH_VALUE returns value evaluated at the row that is the nth row of the window frame (counting from 1); null if no such row
var NTH_VALUE = jet.NTH_VALUE
//--------------------- String functions ------------------//
// BIT_LENGTH returns number of bits in string expression

63
postgres/select_statement.go
View file

@ -1,6 +1,9 @@
package postgres
import "github.com/go-jet/jet/internal/jet"
import (
"github.com/go-jet/jet/internal/jet"
"math"
)
// RowLock is interface for SELECT statement row lock types
type RowLock = jet.RowLock
@ -13,6 +16,27 @@ var (
KEY_SHARE = jet.NewRowLock("KEY SHARE")
)
// Window function clauses
var (
PARTITION_BY = jet.PARTITION_BY
ORDER_BY = jet.ORDER_BY
UNBOUNDED = int64(math.MaxInt64)
CURRENT_ROW = jet.CURRENT_ROW
)
// PRECEDING window frame clause
func PRECEDING(offset int64) jet.FrameExtent {
return jet.PRECEDING(toJetFrameOffset(offset))
}
// FOLLOWING window frame clause
func FOLLOWING(offset int64) jet.FrameExtent {
return jet.FOLLOWING(toJetFrameOffset(offset))
}
// Window definition reference
var Window = jet.WindowName
// SelectStatement is interface for PostgreSQL SELECT statement
type SelectStatement interface {
Statement
@ -24,6 +48,7 @@ type SelectStatement interface {
WHERE(expression BoolExpression) SelectStatement
GROUP_BY(groupByClauses ...jet.GroupByClause) SelectStatement
HAVING(boolExpression BoolExpression) SelectStatement
WINDOW(name string) windowExpand
ORDER_BY(orderByClauses ...jet.OrderByClause) SelectStatement
LIMIT(limit int64) SelectStatement
OFFSET(offset int64) SelectStatement
@ -47,15 +72,9 @@ func SELECT(projection Projection, projections ...Projection) SelectStatement {
func newSelectStatement(table ReadableTable, projections []Projection) SelectStatement {
newSelect := &selectStatementImpl{}
newSelect.ExpressionStatement = jet.NewExpressionStatementImpl(Dialect, jet.SelectStatementType, newSelect, &newSelect.Select,
&newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.OrderBy,
&newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.Window, &newSelect.OrderBy,
&newSelect.Limit, &newSelect.Offset, &newSelect.For)
// statementImpl = jet.NewStatementImpl(Dialect, jet.SelectStatementType, newSelect, &newSelect.Select,
// &newSelect.From, &newSelect.Where, &newSelect.GroupBy, &newSelect.Having, &newSelect.OrderBy,
// &newSelect.Limit, &newSelect.Offset, &newSelect.For)
//
//newSelect.expressionStatementImpl.expressionInterfaceImpl.Parent = newSelect
newSelect.Select.Projections = toJetProjectionList(projections)
newSelect.From.Table = table
newSelect.Limit.Count = -1
@ -75,6 +94,7 @@ type selectStatementImpl struct {
Where jet.ClauseWhere
GroupBy jet.ClauseGroupBy
Having jet.ClauseHaving
Window jet.ClauseWindow
OrderBy jet.ClauseOrderBy
Limit jet.ClauseLimit
Offset jet.ClauseOffset
@ -106,6 +126,11 @@ func (s *selectStatementImpl) HAVING(boolExpression BoolExpression) SelectStatem
return s
}
func (s *selectStatementImpl) WINDOW(name string) windowExpand {
s.Window.Definitions = append(s.Window.Definitions, jet.WindowDefinition{Name: name})
return windowExpand{selectStatement: s}
}
func (s *selectStatementImpl) ORDER_BY(orderByClauses ...jet.OrderByClause) SelectStatement {
s.OrderBy.List = orderByClauses
return s
@ -129,3 +154,25 @@ func (s *selectStatementImpl) FOR(lock RowLock) SelectStatement {
func (s *selectStatementImpl) AsTable(alias string) SelectTable {
return newSelectTable(s, alias)
}
//-----------------------------------------------------
type windowExpand struct {
selectStatement *selectStatementImpl
}
func (w windowExpand) AS(window ...jet.Window) SelectStatement {
if len(window) == 0 {
return w.selectStatement
}
windowsDefinition := w.selectStatement.Window.Definitions
windowsDefinition[len(windowsDefinition)-1].Window = window[0]
return w.selectStatement
}
func toJetFrameOffset(offset int64) jet.Serializer {
if offset == UNBOUNDED {
return jet.UNBOUNDED
}
return jet.FixedLiteral(offset)
}

113
tests/mysql/select_test.go
View file

@ -1,6 +1,7 @@
package mysql
import (
"fmt"
"github.com/go-jet/jet/internal/testutils"
. "github.com/go-jet/jet/mysql"
"github.com/go-jet/jet/tests/.gentestdata/mysql/dvds/enum"
@ -527,3 +528,115 @@ LOCK IN SHARE MODE;
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}
func TestWindowFunction(t *testing.T) {
if sourceIsMariaDB() {
return
}
var expectedSQL = `
SELECT AVG(payment.amount) OVER (),
AVG(payment.amount) OVER (PARTITION BY payment.customer_id),
MAX(payment.amount) OVER (ORDER BY payment.payment_date DESC),
MIN(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
SUM(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC ROWS BETWEEN 1 PRECEDING AND 6 FOLLOWING),
SUM(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
MAX(payment.customer_id) OVER (ORDER BY payment.payment_date DESC ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING),
MIN(payment.customer_id) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
SUM(payment.customer_id) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
ROW_NUMBER() OVER (ORDER BY payment.payment_date),
RANK() OVER (ORDER BY payment.payment_date),
DENSE_RANK() OVER (ORDER BY payment.payment_date),
CUME_DIST() OVER (ORDER BY payment.payment_date),
NTILE(11) OVER (ORDER BY payment.payment_date),
LAG(payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount, 2, payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount, 2, ?) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount, 2, payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount, 2, ?) OVER (ORDER BY payment.payment_date),
FIRST_VALUE(payment.amount) OVER (ORDER BY payment.payment_date),
LAST_VALUE(payment.amount) OVER (ORDER BY payment.payment_date),
NTH_VALUE(payment.amount, 3) OVER (ORDER BY payment.payment_date)
FROM dvds.payment
WHERE payment.payment_id < ?
GROUP BY payment.amount, payment.customer_id, payment.payment_date;
`
query := Payment.
SELECT(
AVG(Payment.Amount).OVER(),
AVG(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID)),
MAXf(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate.DESC())),
MINf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
SUMf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).
ORDER_BY(Payment.PaymentDate.DESC()).ROWS(PRECEDING(1), FOLLOWING(6))),
SUMf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).
ORDER_BY(Payment.PaymentDate.DESC()).RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED))),
MAXi(Payment.CustomerID).OVER(ORDER_BY(Payment.PaymentDate.DESC()).ROWS(CURRENT_ROW, FOLLOWING(UNBOUNDED))),
MINi(Payment.CustomerID).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
SUMi(Payment.CustomerID).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
ROW_NUMBER().OVER(ORDER_BY(Payment.PaymentDate)),
RANK().OVER(ORDER_BY(Payment.PaymentDate)),
DENSE_RANK().OVER(ORDER_BY(Payment.PaymentDate)),
CUME_DIST().OVER(ORDER_BY(Payment.PaymentDate)),
NTILE(11).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2, Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2, 100).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2, Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2, 100).OVER(ORDER_BY(Payment.PaymentDate)),
FIRST_VALUE(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAST_VALUE(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
NTH_VALUE(Payment.Amount, 3).OVER(ORDER_BY(Payment.PaymentDate)),
).GROUP_BY(Payment.Amount, Payment.CustomerID, Payment.PaymentDate).
WHERE(Payment.PaymentID.LT(Int(10)))
fmt.Println(query.Sql())
testutils.AssertStatementSql(t, query, expectedSQL, 100, 100, int64(10))
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}
func TestWindowClause(t *testing.T) {
var expectedSQL = `
SELECT AVG(payment.amount) OVER (),
AVG(payment.amount) OVER (w1),
AVG(payment.amount) OVER (w2 ORDER BY payment.customer_id RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
AVG(payment.amount) OVER (w3 RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
FROM dvds.payment
WHERE payment.payment_id < ?
WINDOW w1 AS (PARTITION BY payment.payment_date), w2 AS (w1), w3 AS (w2 ORDER BY payment.customer_id)
ORDER BY payment.customer_id;
`
query := Payment.SELECT(
AVG(Payment.Amount).OVER(),
AVG(Payment.Amount).OVER(Window("w1")),
AVG(Payment.Amount).OVER(
Window("w2").
ORDER_BY(Payment.CustomerID).
RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED)),
),
AVG(Payment.Amount).OVER(Window("w3").RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED))),
).
WHERE(Payment.PaymentID.LT(Int(10))).
WINDOW("w1").AS(PARTITION_BY(Payment.PaymentDate)).
WINDOW("w2").AS(Window("w1")).
WINDOW("w3").AS(Window("w2").ORDER_BY(Payment.CustomerID)).
ORDER_BY(Payment.CustomerID)
fmt.Println(query.Sql())
testutils.AssertStatementSql(t, query, expectedSQL, int64(10))
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}

107
tests/postgres/select_test.go
View file

@ -1615,3 +1615,110 @@ SELECT true,
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}
func TestWindowFunction(t *testing.T) {
var expectedSQL = `
SELECT AVG(payment.amount) OVER (),
AVG(payment.amount) OVER (PARTITION BY payment.customer_id),
MAX(payment.amount) OVER (ORDER BY payment.payment_date DESC),
MIN(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
SUM(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC ROWS BETWEEN 1 PRECEDING AND 6 FOLLOWING),
SUM(payment.amount) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
MAX(payment.customer_id) OVER (ORDER BY payment.payment_date DESC ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING),
MIN(payment.customer_id) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
SUM(payment.customer_id) OVER (PARTITION BY payment.customer_id ORDER BY payment.payment_date DESC),
ROW_NUMBER() OVER (ORDER BY payment.payment_date),
RANK() OVER (ORDER BY payment.payment_date),
DENSE_RANK() OVER (ORDER BY payment.payment_date),
CUME_DIST() OVER (ORDER BY payment.payment_date),
NTILE(11) OVER (ORDER BY payment.payment_date),
LAG(payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount, 2, payment.amount) OVER (ORDER BY payment.payment_date),
LAG(payment.amount, 2, $1) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount, 2, payment.amount) OVER (ORDER BY payment.payment_date),
LEAD(payment.amount, 2, $2) OVER (ORDER BY payment.payment_date),
FIRST_VALUE(payment.amount) OVER (ORDER BY payment.payment_date),
LAST_VALUE(payment.amount) OVER (ORDER BY payment.payment_date),
NTH_VALUE(payment.amount, 3) OVER (ORDER BY payment.payment_date)
FROM dvds.payment
WHERE payment.payment_id < $3
GROUP BY payment.amount, payment.customer_id, payment.payment_date;
`
query := Payment.
SELECT(
AVG(Payment.Amount).OVER(),
AVG(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID)),
MAXf(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate.DESC())),
MINf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
SUMf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).
ORDER_BY(Payment.PaymentDate.DESC()).ROWS(PRECEDING(1), FOLLOWING(6))),
SUMf(Payment.Amount).OVER(PARTITION_BY(Payment.CustomerID).
ORDER_BY(Payment.PaymentDate.DESC()).RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED))),
MAXi(Payment.CustomerID).OVER(ORDER_BY(Payment.PaymentDate.DESC()).ROWS(CURRENT_ROW, FOLLOWING(UNBOUNDED))),
MINi(Payment.CustomerID).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
SUMi(Payment.CustomerID).OVER(PARTITION_BY(Payment.CustomerID).ORDER_BY(Payment.PaymentDate.DESC())),
ROW_NUMBER().OVER(ORDER_BY(Payment.PaymentDate)),
RANK().OVER(ORDER_BY(Payment.PaymentDate)),
DENSE_RANK().OVER(ORDER_BY(Payment.PaymentDate)),
CUME_DIST().OVER(ORDER_BY(Payment.PaymentDate)),
NTILE(11).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2, Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAG(Payment.Amount, 2, 100).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2, Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LEAD(Payment.Amount, 2, 100).OVER(ORDER_BY(Payment.PaymentDate)),
FIRST_VALUE(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
LAST_VALUE(Payment.Amount).OVER(ORDER_BY(Payment.PaymentDate)),
NTH_VALUE(Payment.Amount, 3).OVER(ORDER_BY(Payment.PaymentDate)),
).GROUP_BY(Payment.Amount, Payment.CustomerID, Payment.PaymentDate).
WHERE(Payment.PaymentID.LT(Int(10)))
fmt.Println(query.Sql())
testutils.AssertStatementSql(t, query, expectedSQL, 100, 100, int64(10))
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}
func TestWindowClause(t *testing.T) {
var expectedSQL = `
SELECT AVG(payment.amount) OVER (),
AVG(payment.amount) OVER (w1),
AVG(payment.amount) OVER (w2 ORDER BY payment.customer_id RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING),
AVG(payment.amount) OVER (w3 RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
FROM dvds.payment
WHERE payment.payment_id < $1
WINDOW w1 AS (PARTITION BY payment.payment_date), w2 AS (w1), w3 AS (w2 ORDER BY payment.customer_id)
ORDER BY payment.customer_id;
`
query := Payment.SELECT(
AVG(Payment.Amount).OVER(),
AVG(Payment.Amount).OVER(Window("w1")),
AVG(Payment.Amount).OVER(
Window("w2").
ORDER_BY(Payment.CustomerID).
RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED)),
),
AVG(Payment.Amount).OVER(Window("w3").RANGE(PRECEDING(UNBOUNDED), FOLLOWING(UNBOUNDED))),
).
WHERE(Payment.PaymentID.LT(Int(10))).
WINDOW("w1").AS(PARTITION_BY(Payment.PaymentDate)).
WINDOW("w2").AS(Window("w1")).
WINDOW("w3").AS(Window("w2").ORDER_BY(Payment.CustomerID)).
ORDER_BY(Payment.CustomerID)
fmt.Println(query.Sql())
testutils.AssertStatementSql(t, query, expectedSQL, int64(10))
err := query.Query(db, &struct{}{})
assert.NilError(t, err)
}