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Allow omitting one or both boundaries in an array slice specifier.

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Omitted boundaries represent the upper or lower limit of the corresponding
array subscript.  This allows simpler specification of many common
use-cases.

(Revised version of commit 9246af6799)

YUriy Zhuravlev
This commit is contained in:
Tom Lane
2015-12-22 21:05:16 -05:00
parent 0ba3f3bc65
commit 6efbded6e4
15 changed files with 302 additions and 33 deletions
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src/include/utils/array.h
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@@ -377,9 +377,11 @@ extern Datum array_set_element(Datum arraydatum, int nSubscripts, int *indx,
int arraytyplen, int elmlen, bool elmbyval, char elmalign);
extern Datum array_get_slice(Datum arraydatum, int nSubscripts,
int *upperIndx, int *lowerIndx,
bool *upperProvided, bool *lowerProvided,
int arraytyplen, int elmlen, bool elmbyval, char elmalign);
extern Datum array_set_slice(Datum arraydatum, int nSubscripts,
int *upperIndx, int *lowerIndx,
bool *upperProvided, bool *lowerProvided,
Datum srcArrayDatum, bool isNull,
int arraytyplen, int elmlen, bool elmbyval, char elmalign);