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--- instant_alter_limit.result 2020-05-26 18:01:27.377946439 +0530
+++ instant_alter_limit,8k.reject 2020-05-26 20:19:50.881869095 +0530
@@ -5,6 +5,28 @@
ENGINE=InnoDB;
INSERT INTO t VALUES(1,2,3,4,5);
SET innodb_strict_mode = OFF;
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
SELECT * FROM t;
b d a c e
NULL NULL 1 NULL NULL
@@ -12,11 +34,17 @@
ADD COLUMN b INT, ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
ALTER TABLE t CHANGE COLUMN b beta INT AFTER a, ALGORITHM=INSTANT;
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
ALTER TABLE t DROP e, DROP c, DROP d, ALGORITHM=INSTANT;
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
SELECT * FROM t;
a beta
1 NULL
ALTER TABLE t DROP COLUMN beta, ALGORITHM=INSTANT;
+Warnings:
+Warning 139 Row size too large (> 4030). Changing some columns to TEXT or BLOB may help. In current row format, BLOB prefix of 0 bytes is stored inline.
ALTER TABLE t ADD COLUMN b INT NOT NULL, ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported for this operation. Try ALGORITHM=INPLACE
SELECT variable_value-@old_instant instants
@@ -43,5 +71,12 @@
FROM information_schema.global_status
WHERE variable_name = 'innodb_instant_alter_column';
instants
-502
+492
DROP TABLE t;
+#
+# MDEV-21787 Alter table failure tries to access uninitialized column
+#
+CREATE TABLE t1(f1 INT PRIMARY KEY, f2 TEXT GENERATED ALWAYS AS (SUBSTR(f4, 1, 400)), f3 VARCHAR(500), f4 TEXT)ENGINE=InnoDB ROW_FORMAT=Compact;
+ALTER TABLE t1 ADD UNIQUE KEY (f2(9));
+ALTER TABLE t1 ADD COLUMN f5 TEXT, ALGORITHM=INPLACE;
+DROP TABLE t1;
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