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Add num_nulls() and num_nonnulls() to count NULL arguments.

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An example use-case is "CHECK(num_nonnulls(a,b,c) = 1)" to assert that
exactly one of a,b,c isn't NULL.  The functions are variadic, so they
can also be pressed into service to count the number of null or nonnull
elements in an array.

Marko Tiikkaja, reviewed by Pavel Stehule
This commit is contained in:
Tom Lane
2016-02-04 23:03:10 -05:00
parent d0cd7bda97
commit 6819514fca
9 changed files with 347 additions and 8 deletions
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4
src/include/utils/builtins.h
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@@ -490,6 +490,8 @@ extern Datum pg_ls_dir(PG_FUNCTION_ARGS);
extern Datum pg_ls_dir_1arg(PG_FUNCTION_ARGS);
/* misc.c */
extern Datum pg_num_nulls(PG_FUNCTION_ARGS);
extern Datum pg_num_nonnulls(PG_FUNCTION_ARGS);
extern Datum current_database(PG_FUNCTION_ARGS);
extern Datum current_query(PG_FUNCTION_ARGS);
extern Datum pg_cancel_backend(PG_FUNCTION_ARGS);
@@ -823,7 +825,7 @@ extern Datum textoverlay_no_len(PG_FUNCTION_ARGS);
extern Datum name_text(PG_FUNCTION_ARGS);
extern Datum text_name(PG_FUNCTION_ARGS);
extern int varstr_cmp(char *arg1, int len1, char *arg2, int len2, Oid collid);
extern void varstr_sortsupport(SortSupport ssup, Oid collid, bool bpchar);
extern void varstr_sortsupport(SortSupport ssup, Oid collid, bool bpchar);
extern int varstr_levenshtein(const char *source, int slen,
const char *target, int tlen,
int ins_c, int del_c, int sub_c,