diff options
Diffstat (limited to 'doc/src/sgml/gist.sgml')
| -rw-r--r-- | doc/src/sgml/gist.sgml | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/doc/src/sgml/gist.sgml b/doc/src/sgml/gist.sgml index 638d912dc2d..99098ab2522 100644 --- a/doc/src/sgml/gist.sgml +++ b/doc/src/sgml/gist.sgml @@ -290,8 +290,8 @@ CREATE INDEX ON my_table USING GIST (my_inet_column inet_ops); The optional eleventh method <function>sortsupport</function> is used to speed up building a <acronym>GiST</acronym> index. The optional twelfth method <function>stratnum</function> is used to - translate well-known <literal>RT*StrategyNumber</literal>s (from - <filename>src/include/access/stratnum.h</filename>) into strategy numbers + translate compare types (from + <filename>src/include/nodes/primnodes.h</filename>) into strategy numbers used by the operator class. This lets the core code look up operators for temporal constraint indexes. </para> @@ -1173,8 +1173,8 @@ my_sortsupport(PG_FUNCTION_ARGS) <term><function>stratnum</function></term> <listitem> <para> - Given an <literal>RT*StrategyNumber</literal> value from - <filename>src/include/access/stratnum.h</filename>, returns a strategy + Given a <literal>CompareType</literal> value from + <filename>src/include/nodes/primnodes.h</filename>, returns a strategy number used by this operator class for matching functionality. The function should return <literal>InvalidStrategy</literal> if the operator class has no matching strategy. @@ -1184,7 +1184,7 @@ my_sortsupport(PG_FUNCTION_ARGS) This is used for temporal index constraints (i.e., <literal>PRIMARY KEY</literal> and <literal>UNIQUE</literal>). If the operator class provides this function and it returns results for - <literal>RTEqualStrategyNumber</literal>, it can be used in the + <literal>COMPARE_EQ</literal>, it can be used in the non-<literal>WITHOUT OVERLAPS</literal> part(s) of an index constraint. </para> @@ -1194,7 +1194,7 @@ my_sortsupport(PG_FUNCTION_ARGS) <programlisting> CREATE OR REPLACE FUNCTION my_stratnum(integer) -RETURNS integer +RETURNS smallint AS 'MODULE_PATHNAME' LANGUAGE C STRICT; </programlisting> @@ -1209,12 +1209,12 @@ PG_FUNCTION_INFO_V1(my_stratnum); Datum my_stratnum(PG_FUNCTION_ARGS) { - StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(1); + CompareType cmptype = PG_GETARG_INT32(0); StrategyNumber ret = InvalidStrategy; - switch (strategy) + switch (cmptype) { - case RTEqualStrategyNumber: + case COMPARE_EQ: ret = BTEqualStrategyNumber; } @@ -1226,9 +1226,9 @@ my_stratnum(PG_FUNCTION_ARGS) <para> One translation function is provided by <productname>PostgreSQL</productname>: - <literal>gist_stratnum_identity</literal> is for operator classes that - already use the <literal>RT*StrategyNumber</literal> constants. It - returns whatever is passed to it. The <literal>btree_gist</literal> + <literal>gist_stratnum_common</literal> is for operator classes that + use the <literal>RT*StrategyNumber</literal> constants. + The <literal>btree_gist</literal> extension defines a second translation function, <literal>gist_stratnum_btree</literal>, for operator classes that use the <literal>BT*StrategyNumber</literal> constants. |