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Added support for DESC and NULLS FIRST/LAST to index keys

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Fixes issue #3
This commit is contained in:
Daniele Varrazzo
2012-12-09 01:11:39 +00:00
parent 1a0a28d3f8
commit a47686a7ee
3 changed files with 85 additions and 4 deletions
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43
lib/repack.c
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@ -472,6 +472,36 @@ parse_indexdef(IndexDef *stmt, Oid index, Oid table)
stmt->options = sql;
}
/*
* Parse the trailing ... [ 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)
{
#if PG_VERSION_NUM >= 80300
char *pos;
/* easier to walk backwards than to parse quotes and escapes... */
if (NULL != (pos = strstr(token, " NULLS FIRST")))
{
*nulls = pos + 1;
*pos = '\0';
}
else if (NULL != (pos = strstr(token, " NULLS LAST")))
{
*nulls = pos + 1;
*pos = '\0';
}
if (NULL != (pos = strstr(token, " DESC")))
{
*desc = pos + 1;
*pos = '\0';
}
#endif
}
/**
* @fn Datum repack_get_index_keys(PG_FUNCTION_ARGS)
* @brief Get key definition of the index.
@ -514,12 +544,18 @@ repack_get_index_keys(PG_FUNCTION_ARGS)
for (nattr = 0, next = stmt.columns; next; nattr++)
{
char *opcname;
char *coldesc = NULL;
char *colnulls = NULL;
token = next;
while (isspace((unsigned char) *token))
token++;
next = skip_until(index, next, ',');
parse_desc_nulls(token, &coldesc, &colnulls);
opcname = skip_until(index, token, ' ');
appendStringInfoString(&str, token);
if (coldesc)
appendStringInfo(&str, " %s", coldesc);
if (opcname)
{
/* lookup default operator name from operator class */
@ -556,12 +592,11 @@ repack_get_index_keys(PG_FUNCTION_ARGS)
elog(ERROR, "missing operator %d(%u,%u) in opfamily %u",
strategy, opcintype, opcintype, opfamily);
opcname[-1] = '\0';
appendStringInfo(&str, "%s USING %s", token, get_opname(oprid));
appendStringInfo(&str, " USING %s", get_opname(oprid));
}
else
appendStringInfoString(&str, token);
if (colnulls)
appendStringInfo(&str, " %s", colnulls);
if (next)
appendStringInfoString(&str, ", ");
}