executor: display pre_split_regions for auto_random tables in `SHOW…

… CREATE` (#49781) close #49839
pingcap · Dec 27, 2023 · 30b2b8f · 30b2b8f
1 parent d0d24ae
commit 30b2b8f
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Showing 3 changed files with 18 additions and 0 deletions.
diff --git a/pkg/executor/show.go b/pkg/executor/show.go
@@ -1294,6 +1294,10 @@ func constructResultOfShowCreateTable(ctx sessionctx.Context, dbName *model.CISt
 		buf.WriteString("*/")
 	}
 
+	if tableInfo.AutoRandomBits > 0 && tableInfo.PreSplitRegions > 0 {
+		fmt.Fprintf(buf, " /*T! PRE_SPLIT_REGIONS=%d */", tableInfo.PreSplitRegions)
+	}
+
 	if len(tableInfo.Comment) > 0 {
 		fmt.Fprintf(buf, " COMMENT='%s'", format.OutputFormat(tableInfo.Comment))
 	}

diff --git a/tests/integrationtest/r/executor/show.result b/tests/integrationtest/r/executor/show.result
@@ -1123,3 +1123,12 @@ select * from information_schema.COLLATIONS where IS_DEFAULT='Yes' and CHARACTER
 COLLATION_NAME	CHARACTER_SET_NAME	ID	IS_DEFAULT	IS_COMPILED	SORTLEN
 utf8mb4_bin	utf8mb4	46	Yes	Yes	1
 set @@session.default_collation_for_utf8mb4=default;
+DROP TABLE IF EXISTS `t`;
+CREATE TABLE `t` (a BIGINT PRIMARY KEY AUTO_RANDOM(2), b INT) PRE_SPLIT_REGIONS=4;
+SHOW CREATE TABLE `t`;
+Table	Create Table
+t	CREATE TABLE `t` (
+  `a` bigint(20) NOT NULL /*T![auto_rand] AUTO_RANDOM(2) */,
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`) /*T![clustered_index] CLUSTERED */
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin /*T! PRE_SPLIT_REGIONS=2 */
diff --git a/tests/integrationtest/t/executor/show.test b/tests/integrationtest/t/executor/show.test
@@ -427,3 +427,8 @@ select * from information_schema.COLLATIONS;
 show character set like '%utf8mb4%';
 select * from information_schema.COLLATIONS where IS_DEFAULT='Yes' and CHARACTER_SET_NAME='utf8mb4';
 set @@session.default_collation_for_utf8mb4=default;
+
+# TestShowPreSplitRegionsForAutoRandomTables
+DROP TABLE IF EXISTS `t`;
+CREATE TABLE `t` (a BIGINT PRIMARY KEY AUTO_RANDOM(2), b INT) PRE_SPLIT_REGIONS=4;
+SHOW CREATE TABLE `t`;