infoschema: fix sub_part in information_schema.statistics table (p…

…ingcap#55814) close pingcap#55812
qw4990 · Sep 3, 2024 · 0816166 · 0816166
1 parent dd180de
commit 0816166
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Showing 3 changed files with 18 additions and 2 deletions.
diff --git a/pkg/executor/infoschema_reader.go b/pkg/executor/infoschema_reader.go
@@ -472,6 +472,11 @@ func (e *memtableRetriever) setDataForStatisticsInTable(
 				expression = tblCol.GeneratedExprString
 			}
 
+			var subPart any
+			if key.Length != types.UnspecifiedLength {
+				subPart = key.Length
+			}
+
 			record := types.MakeDatums(
 				infoschema.CatalogVal, // TABLE_CATALOG
 				schema.O,              // TABLE_SCHEMA
@@ -483,7 +488,7 @@ func (e *memtableRetriever) setDataForStatisticsInTable(
 				colName,               // COLUMN_NAME
 				"A",                   // COLLATION
 				0,                     // CARDINALITY
-				nil,                   // SUB_PART
+				subPart,               // SUB_PART
 				nil,                   // PACKED
 				nullable,              // NULLABLE
 				"BTREE",               // INDEX_TYPE

diff --git a/tests/integrationtest/r/executor/infoschema_reader.result b/tests/integrationtest/r/executor/infoschema_reader.result
@@ -439,3 +439,9 @@ count(*)
 select count(table_name) from information_schema.tables where table_name = 't';
 count(table_name)
 1
+drop table if exists t;
+create table t (c text);
+alter table t add index idx_t (c(16));
+select SUB_PART from information_schema.statistics where TABLE_SCHEMA = 'executor__infoschema_reader' and TABLE_NAME = 't';
+SUB_PART
+16
diff --git a/tests/integrationtest/t/executor/infoschema_reader.test b/tests/integrationtest/t/executor/infoschema_reader.test
@@ -314,4 +314,9 @@ select table_name, table_schema from information_schema.tables where table_name
 select table_name from information_schema.tables where table_name = 't';
 explain format='brief' select table_name, table_schema from information_schema.tables;
 select count(*) from information_schema.tables where table_name = 't';
-select count(table_name) from information_schema.tables where table_name = 't';
+select count(table_name) from information_schema.tables where table_name = 't';
+
+drop table if exists t;
+create table t (c text);
+alter table t add index idx_t (c(16));
+select SUB_PART from information_schema.statistics where TABLE_SCHEMA = 'executor__infoschema_reader' and TABLE_NAME = 't';