Add integration test for batch warnings

Author: ggilder

localtests/panic-on-warnings-batch-middle/create.sql

@@ -0,0 +1,11 @@
+drop table if exists gh_ost_test;
+create table gh_ost_test (
+  id int auto_increment,
+  email varchar(255) not null,
+  primary key (id)
+) auto_increment=1;
+
+-- Insert initial data - all unique emails
+insert into gh_ost_test (email) values ('alice@example.com');
+insert into gh_ost_test (email) values ('bob@example.com');
+insert into gh_ost_test (email) values ('charlie@example.com');

localtests/panic-on-warnings-batch-middle/expect_failure

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+ERROR warnings detected in statement 1 of 2

localtests/panic-on-warnings-batch-middle/extra_args

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+--default-retries=1 --panic-on-warnings --alter "add unique index email_idx(email)" --postpone-cut-over-flag-file=/tmp/gh-ost-test.postpone-cutover

localtests/panic-on-warnings-batch-middle/test.sh

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+#!/bin/bash
+# Custom test: inject batched DML events AFTER row copy completes
+# Tests that warnings in the middle of a DML batch are detected
+
+# Create postpone flag file (referenced in extra_args)
+postpone_flag_file=/tmp/gh-ost-test.postpone-cutover
+touch $postpone_flag_file
+
+# Set table names (required by build_ghost_command)
+table_name="gh_ost_test"
+ghost_table_name="_gh_ost_test_gho"
+
+# Build gh-ost command using framework function
+build_ghost_command
+
+# Run in background
+echo_dot
+echo > $test_logfile
+bash -c "$cmd" >>$test_logfile 2>&1 &
+ghost_pid=$!
+
+# Wait for row copy to complete
+echo_dot
+for i in {1..30}; do
+    grep -q "Row copy complete" $test_logfile && break
+    ps -p $ghost_pid > /dev/null || { echo; echo "ERROR gh-ost exited early"; rm -f $postpone_flag_file; return 1; }
+    sleep 1; echo_dot
+done
+
+# Inject batched DML events that will create warnings
+# These must be in a single transaction to be batched during binlog replay
+echo_dot
+gh-ost-test-mysql-master test << 'EOF'
+BEGIN;
+-- INSERT with duplicate PRIMARY KEY - warning on migration key (filtered by gh-ost)
+INSERT IGNORE INTO gh_ost_test (id, email) VALUES (1, 'duplicate_pk@example.com');
+-- INSERT with duplicate email - warning on unique index (should trigger failure)
+INSERT IGNORE INTO gh_ost_test (email) VALUES ('alice@example.com');
+-- INSERT with unique data - would succeed if not for previous warning
+INSERT IGNORE INTO gh_ost_test (email) VALUES ('new@example.com');
+COMMIT;
+EOF
+
+# Wait for binlog events to replicate and be applied
+sleep 10; echo_dot
+
+# Complete cutover by removing postpone flag
+rm -f $postpone_flag_file
+
+# Wait for gh-ost to complete
+wait $ghost_pid
+execution_result=$?
+rm -f $postpone_flag_file
+
+# Validate using framework function
+validate_expected_failure
+return $?