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Add three-parameter forms of array_to_string and string_to_array, to allow

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better handling of NULL elements within the arrays.  The third parameter
is a string that should be used to represent a NULL element, or should
be translated into a NULL element, respectively.  If the third parameter
is NULL it behaves the same as the two-parameter form.

There are two incompatible changes in the behavior of the two-parameter form
of string_to_array.  First, it will return an empty (zero-element) array
rather than NULL when the input string is of zero length.  Second, if the
field separator is NULL, the function splits the string into individual
characters, rather than returning NULL as before.  These two changes make
this form fully compatible with the behavior of the new three-parameter form.

Pavel Stehule, reviewed by Brendan Jurd
This commit is contained in:
Tom Lane
2010-08-10 21:51:00 +00:00
parent 5148a04636
commit 33f43725fb
9 changed files with 390 additions and 95 deletions
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4
src/include/utils/builtins.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.353 2010/08/05 18:21:19 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.354 2010/08/10 21:51:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -716,6 +716,8 @@ extern text *replace_text_regexp(text *src_text, void *regexp,
extern Datum split_text(PG_FUNCTION_ARGS);
extern Datum text_to_array(PG_FUNCTION_ARGS);
extern Datum array_to_text(PG_FUNCTION_ARGS);
extern Datum text_to_array_null(PG_FUNCTION_ARGS);
extern Datum array_to_text_null(PG_FUNCTION_ARGS);
extern Datum to_hex32(PG_FUNCTION_ARGS);
extern Datum to_hex64(PG_FUNCTION_ARGS);
extern Datum md5_text(PG_FUNCTION_ARGS);