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Add support for postgres GROUPING SET, ROLLUP and CUBE grouping operators

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Add support for mysql WITH ROLLUP grouping operator
Add support for GROUPING operator
This commit is contained in:
go-jet 2023-03-28 13:16:57 +02:00
parent 31dc7b6dd3
commit fa69565dbf
9 changed files with 476 additions and 70 deletions
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33
postgres/functions.go
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@ -13,7 +13,7 @@ var (
OR = jet.OR
)
// ROW is construct one table row from list of expressions.
// ROW function is used to create a tuple value that consists of a set of expressions or column values.
var ROW = jet.ROW
// ------------------ Mathematical functions ---------------//
@ -390,3 +390,34 @@ func castFloatLiteral(fraction FloatExpression) FloatExpression {
}
return fraction
}
// ----------------- Group By operators --------------------------//
// GROUPING_SETS operator allows grouping of the rows in a table by multiple sets of columns(or expressions) in a single query.
// This can be useful when we want to analyze data by different combinations of columns, without having to write separate
// queries for each combination. GROUPING_SETS sets of columns are constructed with WRAP method.
//
// GROUPING_SETS(
// WRAP(Inventory.FilmID, Inventory.StoreID),
// WRAP(),
// ),
var GROUPING_SETS = jet.GROUPING_SETS
// WRAP wraps list of expressions with brackets - ( expression1, expression2, ... )
// The construct (a, b) is normally recognized in expressions as a row constructor. WRAP and ROW method behave exactly the same,
// except when used in GROUPING_SETS. For top level GROUPING SETS expression lists WRAP has to be used.
var WRAP = jet.WRAP
// ROLLUP operator is used with the GROUP BY clause to generate all prefixes of a group of columns including the empty list.
// It creates extra rows in the result set that represent the subtotal values for each combination of columns.
var ROLLUP = jet.ROLLUP
// CUBE operator is used with the GROUP BY clause to generate subtotals for all possible combinations of a group of columns.
// It creates extra rows in the result set that represent the subtotal values for each combination of columns.
var CUBE = jet.CUBE
// GROUPING function is used to identify which columns are included in a grouping set or a subtotal row. It takes as input
// the name of a column and returns 1 if the column is not included in the current grouping set, and 0 otherwise.
// It can be also used with multiple parameters to check if a set of columns is included in the current grouping set. The result
// of the GROUPING function would then be an integer bit mask having 1’s for the arguments which have GROUPING(argument) as 1.
var GROUPING = jet.GROUPING