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Add num_nulls() and num_nonnulls() to count NULL arguments.
An example use-case is "CHECK(num_nonnulls(a,b,c) = 1)" to assert thatexactly one of a,b,c isn't NULL. The functions are variadic, so theycan also be pressed into service to count the number of null or nonnullelements in an array.Marko Tiikkaja, reviewed by Pavel Stehule1 parentd0cd7bd commit6819514
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9 files changed
+347
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lines changed- doc/src/sgml
- src
- backend/utils/adt
- include
- catalog
- utils
- test/regress
- expected
- sql
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