Generated column as part of UNIQUE (or PRIMARY) KEY (#919)

* v1.1.0

* WIP: copying AUTO_INCREMENT value to ghost table
Initial commit: towards setting up a test suite

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* greping for 'expect_table_structure' content

* Adding simple test for 'expect_table_structure' scenario

* adding tests for AUTO_INCREMENT value after row deletes. Should initially fail

* clear event beforehand

* parsing AUTO_INCREMENT from alter query, reading AUTO_INCREMENT from original table, applying AUTO_INCREMENT value onto ghost table if applicable and user has not specified AUTO_INCREMENT in alter statement

* support GetUint64

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* minor update to test

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* adding test for user defined AUTO_INCREMENT statement

* Generated column as part of UNIQUE (or PRIMARY) KEY

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* skip analysis of generated column data type in unique key

Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

Author: shlomi-noach

go/logic/inspect.go

@@ -190,6 +190,10 @@ func (this *Inspector) inspectOriginalAndGhostTables() (err error) {
 	}
 
 	for _, column := range this.migrationContext.UniqueKey.Columns.Columns() {
+		if this.migrationContext.GhostTableVirtualColumns.GetColumn(column.Name) != nil {
+			// this is a virtual column
+			continue
+		}
 		if this.migrationContext.MappedSharedColumns.HasTimezoneConversion(column.Name) {
 			return fmt.Errorf("No support at this time for converting a column from DATETIME to TIMESTAMP that is also part of the chosen unique key. Column: %s, key: %s", column.Name, this.migrationContext.UniqueKey.Name)
 		}

localtests/generated-columns57-unique/create.sql

@@ -0,0 +1,30 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  `idb` varchar(36) CHARACTER SET utf8mb4 GENERATED ALWAYS AS (json_unquote(json_extract(`jsonobj`,_utf8mb4'$._id'))) STORED NOT NULL,
+  `jsonobj` json NOT NULL,
+  PRIMARY KEY (`id`,`idb`)
+) auto_increment=1;
+
+insert into gh_ost_test (id, jsonobj) values (null, '{"_id":2}');
+insert into gh_ost_test (id, jsonobj) values (null, '{"_id":3}');
+
+drop event if exists gh_ost_test;
+delimiter ;;
+create event gh_ost_test
+  on schedule every 1 second
+  starts current_timestamp
+  ends current_timestamp + interval 60 second
+  on completion not preserve
+  enable
+  do
+begin
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":5}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":7}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":11}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":13}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":17}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":19}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":23}');
+  insert into gh_ost_test (id, jsonobj) values (null, '{"_id":27}');
+end ;;

localtests/generated-columns57-unique/ignore_versions

@@ -0,0 +1 @@
+(5.5|5.6)