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Added support for COLLATE to index keys

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This commit is contained in:
Daniele Varrazzo 2012-12-09 12:02:49 +00:00
parent 4bcb7641c9
commit 13cf8679db
3 changed files with 20 additions and 5 deletions
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7
bin/expected/repack.out
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@ -322,6 +322,7 @@ CREATE UNIQUE INDEX issue3_idx1 ON issue3 (col1, col2 DESC);
CREATE UNIQUE INDEX issue3_idx2 ON issue3 (col1 DESC, col2 text_pattern_ops);
CREATE UNIQUE INDEX issue3_idx3 ON issue3 (col1 DESC, col2 DESC);
CREATE UNIQUE INDEX issue3_idx4 ON issue3 (col1 NULLS FIRST, col2 text_pattern_ops DESC NULLS LAST);
CREATE UNIQUE INDEX issue3_idx5 ON issue3 (col1 DESC NULLS FIRST, col2 COLLATE "POSIX" DESC);
SELECT repack.get_order_by('issue3_idx1'::regclass::oid, 'issue3'::regclass::oid);
get_order_by
-----------------
@ -346,3 +347,9 @@ SELECT repack.get_order_by('issue3_idx4'::regclass::oid, 'issue3'::regclass::oid
col1 NULLS FIRST, col2 DESC USING ~<~ NULLS LAST
(1 row)
SELECT repack.get_order_by('issue3_idx5'::regclass::oid, 'issue3'::regclass::oid);
get_order_by
--------------------------------------
col1 DESC, col2 COLLATE "POSIX" DESC
(1 row)

2
bin/sql/repack.sql
View File

@ -196,8 +196,10 @@ CREATE UNIQUE INDEX issue3_idx1 ON issue3 (col1, col2 DESC);
CREATE UNIQUE INDEX issue3_idx2 ON issue3 (col1 DESC, col2 text_pattern_ops);
CREATE UNIQUE INDEX issue3_idx3 ON issue3 (col1 DESC, col2 DESC);
CREATE UNIQUE INDEX issue3_idx4 ON issue3 (col1 NULLS FIRST, col2 text_pattern_ops DESC NULLS LAST);
CREATE UNIQUE INDEX issue3_idx5 ON issue3 (col1 DESC NULLS FIRST, col2 COLLATE "POSIX" DESC);
SELECT repack.get_order_by('issue3_idx1'::regclass::oid, 'issue3'::regclass::oid);
SELECT repack.get_order_by('issue3_idx2'::regclass::oid, 'issue3'::regclass::oid);
SELECT repack.get_order_by('issue3_idx3'::regclass::oid, 'issue3'::regclass::oid);
SELECT repack.get_order_by('issue3_idx4'::regclass::oid, 'issue3'::regclass::oid);
SELECT repack.get_order_by('issue3_idx5'::regclass::oid, 'issue3'::regclass::oid);

16
lib/repack.c
View File

@ -473,14 +473,13 @@ parse_indexdef(IndexDef *stmt, Oid index, Oid table)
}
/*
* Parse the trailing ... [ DESC ] [ NULLS { FIRST | LAST } ] from an index
* Parse the trailing ... [ COLLATE X ] [ DESC ] [ NULLS { FIRST | LAST } ] from an index
* definition column.
* Returned values point to token. \0's are inserted to separate parsed parts.
*/
static void
parse_desc_nulls(char *token, char **desc, char **nulls)
parse_indexdef_col(char *token, char **desc, char **nulls, char **collate)
{
#if PG_VERSION_NUM >= 80300
char *pos;
/* easier to walk backwards than to parse quotes and escapes... */
@ -499,7 +498,11 @@ parse_desc_nulls(char *token, char **desc, char **nulls)
*desc = pos + 1;
*pos = '\0';
}
#endif
if (NULL != (pos = strstr(token, " COLLATE ")))
{
*collate = pos + 1;
*pos = '\0';
}
}
/**
@ -543,14 +546,17 @@ repack_get_order_by(PG_FUNCTION_ARGS)
char *opcname;
char *coldesc = NULL;
char *colnulls = NULL;
char *colcollate = NULL;
token = next;
while (isspace((unsigned char) *token))
token++;
next = skip_until(index, next, ',');
parse_desc_nulls(token, &coldesc, &colnulls);
parse_indexdef_col(token, &coldesc, &colnulls, &colcollate);
opcname = skip_until(index, token, ' ');
appendStringInfoString(&str, token);
if (colcollate)
appendStringInfo(&str, " %s", colcollate);
if (coldesc)
appendStringInfo(&str, " %s", coldesc);
if (opcname)