Bug #53814: NUMERIC_PRECISION for unsigned bigint field is 19,

should be 20

Fixed the numeric precision of the unsigned BIGINT column to 
be 20 instead of 19.

mysql-test/r/information_schema.result

@@ -1757,4 +1757,21 @@ WHERE INFORMATION_SCHEMA.COLUMNS.TABLE_NAME = 'variables';
 COLUMN_DEFAULT	TABLE_NAME
 NULL	variables
 DROP TABLE variables;
+#
+# Bug #53814: NUMERIC_PRECISION for unsigned bigint field is 19, 
+# should be 20
+#
+CREATE TABLE ubig (a BIGINT, b BIGINT UNSIGNED);
+SELECT TABLE_NAME, COLUMN_NAME, NUMERIC_PRECISION 
+FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='ubig';
+TABLE_NAME	COLUMN_NAME	NUMERIC_PRECISION
+ubig	a	19
+ubig	b	20
+INSERT INTO ubig VALUES (0xFFFFFFFFFFFFFFFF,0xFFFFFFFFFFFFFFFF);
+Warnings:
+Warning	1264	Out of range value for column 'a' at row 1
+SELECT length(CAST(b AS CHAR)) FROM ubig;
+length(CAST(b AS CHAR))
+20
+DROP TABLE ubig;
 End of 5.1 tests.

mysql-test/t/information_schema.test

@@ -1455,6 +1455,22 @@ FROM INFORMATION_SCHEMA.COLUMNS
 WHERE INFORMATION_SCHEMA.COLUMNS.TABLE_NAME = 'variables';
 DROP TABLE variables;
 
+--echo #
+--echo # Bug #53814: NUMERIC_PRECISION for unsigned bigint field is 19, 
+--echo # should be 20
+--echo #
+
+CREATE TABLE ubig (a BIGINT, b BIGINT UNSIGNED);
+
+SELECT TABLE_NAME, COLUMN_NAME, NUMERIC_PRECISION 
+  FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='ubig';
+
+INSERT INTO ubig VALUES (0xFFFFFFFFFFFFFFFF,0xFFFFFFFFFFFFFFFF);
+SELECT length(CAST(b AS CHAR)) FROM ubig;
+
+DROP TABLE ubig;
+
+
 --echo End of 5.1 tests.
 
 # Wait till all disconnects are completed

sql/sql_show.cc

@@ -3965,10 +3965,13 @@ static int get_schema_column_record(THD *thd, TABLE_LIST *tables,
     case MYSQL_TYPE_TINY:
     case MYSQL_TYPE_SHORT:
     case MYSQL_TYPE_LONG:
-    case MYSQL_TYPE_LONGLONG:
     case MYSQL_TYPE_INT24:
       field_length= field->max_display_length() - 1;
       break;
+    case MYSQL_TYPE_LONGLONG:
+      field_length= field->max_display_length() - 
+        ((field->flags & UNSIGNED_FLAG) ? 0 : 1);
+      break;
     case MYSQL_TYPE_BIT:
       field_length= field->max_display_length();
       decimals= -1;                             // return NULL