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################################################################################
# Bug#24916351 GR KEY GENERATION FOR FOREIGN KEY SHOULD BE IGNORED IF PARENT IS
# NOT YET CREATED
# Problem: When foreign key checks are disabled, user can create a foreign key
# in child table by referring a parent table that does not exists.
# Inserting a tuple into such child table is bringing GR server down.
# Test Steps:
# 0> Test requires only one server.
# 1> Disable foreign key checks.
# 2> Check that we should be able to
# 2.1> Create a child table with a foreign key which refers a table
# which does not exist.
# 2.2> Insert a value in child table even when the parent table
# does not exist.
# 3> Create the parent table.
# 4> Check that we should be able to insert a value in child table even
# when that value is not there in the parent table.
# 5> Enable foreign key checks
# 6> After restoring the foreign key checks check that old behaviour
# is restored.
# 6.1> Throwing error if the value is not present in the parent table
# 6.2> Should able to insert the value if the value is present in the
# parent table.
################################################################################
--source ../inc/have_group_replication_plugin.inc
--source ../inc/group_replication.inc
--echo #########################################################################
--echo # 1. Disable foreign key checks
SET foreign_key_checks=0;
--echo #########################################################################
--echo # 2.1. Should be able to create a table with a foreign key
--echo # which refers a table which does not exist.
CREATE TABLE child_table (c1 INT PRIMARY KEY,
FOREIGN KEY (c1) REFERENCES parent_table(c1));
--echo #########################################################################
--echo # 2.2. Should be able to insert a value in child table even
--echo # when the parent table does not exists because foreign
--echo # key checks are disabled.
INSERT INTO child_table VALUES(1);
--echo #########################################################################
--echo # 3. Create parent table.
CREATE TABLE parent_table (c1 INT PRIMARY KEY);
--echo #########################################################################
--echo # 4. Should be able to insert a value into child table even
--echo # when that value is not there in the parent table
--echo # because foreign key checks are disabled.
INSERT INTO child_table VALUES(2);
--echo #########################################################################
--echo # 5. Enable foreign_key_checks
SET foreign_key_checks=1;
--echo #########################################################################
--echo # 6.1. Foreign key checks are enabled. Now inserting a value into
--echo # child table that does not exists in parent table should
--echo # throw error.
--error ER_NO_REFERENCED_ROW_2
INSERT INTO child_table VALUES(3);
--echo #########################################################################
--echo # 6.2. Insert a tuple into parent_table. Inserting that value
--echo # into child table should be allowed now.
INSERT INTO parent_table VALUES(3);
INSERT INTO child_table VALUES(3);
--echo #########################################################################
--echo # 7. Clean up.
DROP TABLE child_table;
DROP TABLE parent_table;
--source ../inc/group_replication_end.inc