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Add width_bucket(anyelement, anyarray).

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This provides a convenient method of classifying input values into buckets
that are not necessarily equal-width.  It works on any sortable data type.

The choice of function name is a bit debatable, perhaps, but showing that
there's a relationship to the SQL standard's width_bucket() function seems
more attractive than the other proposals.

Petr Jelinek, reviewed by Pavel Stehule
This commit is contained in:
Tom Lane
2014-09-09 15:34:10 -04:00
parent 220bb39dee
commit e80252d424
7 changed files with 458 additions and 12 deletions
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src/include/utils/array.h
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@@ -214,6 +214,7 @@ extern Datum array_fill_with_lower_bounds(PG_FUNCTION_ARGS);
extern Datum array_unnest(PG_FUNCTION_ARGS);
extern Datum array_remove(PG_FUNCTION_ARGS);
extern Datum array_replace(PG_FUNCTION_ARGS);
extern Datum width_bucket_array(PG_FUNCTION_ARGS);
extern Datum array_ref(ArrayType *array, int nSubscripts, int *indx,
int arraytyplen, int elmlen, bool elmbyval, char elmalign,