Make the InnoDB FOREIGN KEY parser understand multi-statements. (Bug #48024)

Also make InnoDB thinks that /*/ only starts a comment. (Bug #53644).

struct trx_struct: Add mysql_query_len.

ha_innodb.cc: Use trx_query_string() instead of trx_query() and
initialize trx->mysql_query_len.

INNOBASE_COPY_STMT(thd, trx): New macro, to initialize
trx->mysql_query_str and trx->mysql_query_len.

dict_strip_comments(): Add and observe the parameter sql_length. Treat
/*/ as the start of a comment.

dict_create_foreign_constraints(), row_table_add_foreign_constraints():
Add the parameter sql_length.

2 files changed, 30 insertions, 0 deletions

diff --git a/mysql-test/suite/innodb/r/innodb_bug48024.result b/mysql-test/suite/innodb/r/innodb_bug48024.result
new file mode 100644
index 00000000000..611923d2796
--- /dev/null
+++ b/mysql-test/suite/innodb/r/innodb_bug48024.result
@@ -0,0 +1,10 @@
+CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
+CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
+ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
+ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b);
+DROP TABLE bug48024,bug48024_b;
+CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
+CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
+ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
+ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b)|
+DROP TABLE bug48024,bug48024_b;
diff --git a/mysql-test/suite/innodb/t/innodb_bug48024.test b/mysql-test/suite/innodb/t/innodb_bug48024.test
new file mode 100644
index 00000000000..00d76beb89d
--- /dev/null
+++ b/mysql-test/suite/innodb/t/innodb_bug48024.test
@@ -0,0 +1,20 @@
+# Bug #48024 Innodb doesn't work with multi-statements
+
+--source include/have_innodb.inc
+
+CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
+CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
+# Bug #53644 InnoDB thinks that /*/ starts and ends a comment
+ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
+ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b);
+
+DROP TABLE bug48024,bug48024_b;
+
+delimiter |;
+CREATE TABLE bug48024(a int PRIMARY KEY,b int NOT NULL,KEY(b)) ENGINE=InnoDB;
+CREATE TABLE bug48024_b(b int PRIMARY KEY) ENGINE=InnoDB;
+ALTER TABLE bug48024 /*/ADD CONSTRAINT FOREIGN KEY(c) REFERENCES(a),/*/
+ADD CONSTRAINT FOREIGN KEY(b) REFERENCES bug48024_b(b)|
+delimiter ;|
+
+DROP TABLE bug48024,bug48024_b;