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Added support for window clause and functions.

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go-jet 2019-09-17 13:34:47 +02:00
parent b7363a554b
commit 5ba10d35db
13 changed files with 973 additions and 48 deletions
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41
postgres/functions.go
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@ -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