MDEV-7563 Support CHECK constraint as in (or close to) SQL Standard

MDEV-10134 Add full support for DEFAULT

- Added support for using tables with MySQL 5.7 virtual fields,
  including MySQL 5.7 syntax
- Better error messages also for old cases
- CREATE ... SELECT now also updates timestamp columns
- Blob can now have default values
- Added new system variable "check_constraint_checks", to turn of
  CHECK constraint checking if needed.
- Removed some engine independent tests in suite vcol to only test myisam
- Moved some tests from 'include' to 't'. Should some day be done for all tests.
- FRM version increased to 11 if one uses virtual fields or constraints
- Changed to use a bitmap to check if a field has got a value, instead of
  setting HAS_EXPLICIT_VALUE bit in field flags
- Expressions can now be up to 65K in total
- Ensure we are not refering to uninitialized fields when handling virtual fields or defaults
- Changed check_vcol_func_processor() to return a bitmap of used types
- Had to change some functions that calculated cached value in fix_fields to do
  this in val() or getdate() instead.
- store_now_in_TIME() now takes a THD argument
- fill_record() now updates default values
- Add a lookahead for NOT NULL, to be able to handle DEFAULT 1+1 NOT NULL
- Automatically generate a name for constraints that doesn't have a name
- Added support for ALTER TABLE DROP CONSTRAINT
- Ensure that partition functions register virtual fields used. This fixes
  some bugs when using virtual fields in a partitioning function

mysql-test/include/function_defaults.inc

@@ -4,51 +4,43 @@ SET TIME_ZONE = "+00:00";
 --echo # Test of errors for column data types that dont support function
 --echo # defaults.
 --echo #
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a BIT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a TINYINT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a SMALLINT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a MEDIUMINT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a INT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a BIGINT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a FLOAT DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a DECIMAL DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a DATE DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a TIME DEFAULT $current_timestamp );
---error ER_INVALID_DEFAULT
-eval CREATE TABLE t1( a YEAR DEFAULT $current_timestamp );
+
+eval CREATE OR REPLACE TABLE t1( a BIT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a TINYINT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a SMALLINT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a MEDIUMINT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a INT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a BIGINT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a FLOAT DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a DECIMAL DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a DATE DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a TIME DEFAULT $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a YEAR DEFAULT $current_timestamp );
 
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a BIT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a BIT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a TINYINT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a TINYINT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a SMALLINT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a SMALLINT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a MEDIUMINT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a MEDIUMINT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a INT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a INT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a BIGINT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a BIGINT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a FLOAT ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a FLOAT ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a DECIMAL ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a DECIMAL ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a DATE ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a DATE ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a TIME ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a TIME ON UPDATE $current_timestamp );
 --error ER_INVALID_ON_UPDATE
-eval CREATE TABLE t1( a YEAR ON UPDATE $current_timestamp );
+eval CREATE OR REPLACE TABLE t1( a YEAR ON UPDATE $current_timestamp );
+
+drop table if exists t1;
 
 --echo #
 --echo # Test that the default clause behaves like NOW() regarding time zones.
@@ -1066,7 +1058,7 @@ SELECT * FROM v1;
 --echo # 1970-01-01 03:33:20
 SET TIMESTAMP = 2000.000234;
 
---error ER_VIEW_CHECK_FAILED
+--error ER_CONSTRAINT_FAILED
 UPDATE v1 SET a = 2;
 SELECT * FROM t1;
 
@@ -1091,7 +1083,7 @@ SELECT * FROM v1;
 
 SET TIMESTAMP = 1.126789;
 
---error ER_VIEW_CHECK_FAILED
+--error ER_CONSTRAINT_FAILED
 INSERT INTO v1 ( c ) VALUES ( 1 ) ON DUPLICATE KEY UPDATE c = 2;
 
 SELECT * FROM v1;