Added implementation for --moveidx

Note: if original namespace is "foo bar", repack_indexdef gives a bad
result. This is weird as apparently skip_ident can deal with spaces in
a quoted identifier. Committing as I'm going home, will deal with that
later.

bin/pg_repack.c

@@ -681,7 +681,7 @@ static bool
 rebuild_indexes(const repack_table *table)
 {
 	PGresult	   *res;
-	const char	   *params[1];
+	const char	   *params[2];
 	int			    num_indexes;
 	int				i;
 	int				num_active_workers;
@@ -693,6 +693,7 @@ rebuild_indexes(const repack_table *table)
 	elog(DEBUG2, "---- create indexes ----");
 
 	params[0] = utoa(table->target_oid, buffer);
+	params[1] = moveidx ? tablespace : NULL;
 
 	/* First, just display a warning message for any invalid indexes
 	 * which may be on the table (mostly to match the behavior of 1.1.8).
@@ -708,8 +709,9 @@ rebuild_indexes(const repack_table *table)
 	}
 
 	res = execute("SELECT indexrelid,"
-		" repack.repack_indexdef(indexrelid, indrelid) "
+		" repack.repack_indexdef(indexrelid, indrelid, $2) "
-		" FROM pg_index WHERE indrelid = $1 AND indisvalid", 1, params);
+		" FROM pg_index WHERE indrelid = $1 AND indisvalid",
+		2, params);
 
 	num_indexes = PQntuples(res);
 

lib/pg_repack.sql.in

@@ -207,9 +207,9 @@ CREATE VIEW repack.tables AS
      AND N.nspname NOT IN ('pg_catalog', 'information_schema')
      AND N.nspname NOT LIKE E'pg\\_temp\\_%';
 
-CREATE FUNCTION repack.repack_indexdef(oid, oid) RETURNS text AS
+CREATE FUNCTION repack.repack_indexdef(oid, oid, name) RETURNS text AS
 'MODULE_PATHNAME', 'repack_indexdef'
-LANGUAGE C STABLE STRICT;
+LANGUAGE C STABLE;
 
 CREATE FUNCTION repack.repack_trigger() RETURNS trigger AS
 'MODULE_PATHNAME', 'repack_trigger'

lib/repack.c

@@ -618,20 +618,62 @@ repack_get_order_by(PG_FUNCTION_ARGS)
  *
  * @param	index	Oid of target index.
  * @param	table	Oid of table of the index.
+ * @param	tablespace	Namespace for the index. If NULL keep the original.
  * @retval			Create index DDL for temp table.
  */
 Datum
 repack_indexdef(PG_FUNCTION_ARGS)
 {
-	Oid				index = PG_GETARG_OID(0);
+	Oid				index;
-	Oid				table = PG_GETARG_OID(1);
+	Oid				table;
+	Name			tablespace = NULL;
 	IndexDef		stmt;
 	StringInfoData	str;
 
+	if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
+		PG_RETURN_NULL();
+
+	index = PG_GETARG_OID(0);
+	table = PG_GETARG_OID(1);
+
+	if (!PG_ARGISNULL(2))
+		tablespace = PG_GETARG_NAME(2);
+
 	parse_indexdef(&stmt, index, table);
+
 	initStringInfo(&str);
-	appendStringInfo(&str, "%s index_%u ON repack.table_%u USING %s (%s)%s",
+	appendStringInfo(&str, "%s index_%u ON repack.table_%u USING %s (%s)",
-		stmt.create, index, table, stmt.type, stmt.columns, stmt.options);
+		stmt.create, index, table, stmt.type, stmt.columns);
+
+	/* Replace the tablespace in the index options */
+	if (tablespace == NULL)
+	{
+		/* tablespace is just fine */
+		appendStringInfoString(&str, stmt.options);
+	}
+	else
+	{
+		const char *pos;
+		if (NULL == (pos = strstr(stmt.options, " TABLESPACE ")))
+		{
+			/* tablespace is to append */
+			appendStringInfoString(&str, " TABLESPACE ");
+			appendStringInfoString(&str, NameStr(*tablespace));
+		}
+		else
+		{
+			char *tmp;
+
+			/* tablespace is to replace */
+			tmp = skip_const(index, stmt.options, " TABLESPACE ", NULL);
+			appendStringInfoString(&str, stmt.options);
+			appendStringInfoString(&str, NameStr(*tablespace));
+			/* FIXME: not working if original ts has a space. But skip_ident
+			 * should deal with that. Stupid mistake somewhere? */
+			tmp = skip_ident(index, tmp);
+			appendStringInfoString(&str, tmp);
+		}
+	}
 
 	PG_RETURN_TEXT_P(cstring_to_text(str.data));
 }