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19 lines
959 B
ReStructuredText
19 lines
959 B
ReStructuredText
Functions for implementing the IN operator
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------------------------------------------
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in, notIn, globalIn, globalNotIn
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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See the section "IN operators".
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tuple(x, y, ...), operator (x, y, ...)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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A function that allows grouping multiple columns.
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For columns with the types T1, T2, ..., it returns a Tuple(T1, T2, ...) type tuple containing these columns. There is no cost to execute the function.
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Tuples are normally used as intermediate values for an argument of IN operators, or for creating a list of formal parameters of lambda functions. Tuples can't be written to a table.
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tupleElement(tuple, n), operator x.N
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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A function that allows getting columns from a tuple.
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'N' is the column index, starting from 1. 'N' must be a constant. 'N' must be a strict postive integer no greater than the size of the tuple.
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There is no cost to execute the function.
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