kaxil commented on code in PR #44790:
URL: https://github.com/apache/airflow/pull/44790#discussion_r1884311891
##########
airflow/migrations/utils.py:
##########
@@ -58,3 +58,35 @@ def disable_sqlite_fkeys(op):
op.execute("PRAGMA foreign_keys=on")
else:
yield op
+
+
+def mysql_drop_foreignkey_if_exists(constraint_name, table_name, op):
+ """Older Mysql versions do not support DROP FOREIGN KEY IF EXISTS."""
+ op.execute(f"""
+ set @var=if((SELECT true FROM information_schema.TABLE_CONSTRAINTS
WHERE
+ CONSTRAINT_SCHEMA = DATABASE() AND
+ TABLE_NAME = '{table_name}' AND
+ CONSTRAINT_NAME = '{constraint_name}' AND
+ CONSTRAINT_TYPE = 'FOREIGN KEY') = true,'ALTER TABLE {table_name}
+ DROP CONSTRAINT {constraint_name}','select 1');
+
+ prepare stmt from @var;
+ execute stmt;
+ deallocate prepare stmt;
+ """)
+
+
+def mysql_drop_index_if_exists(index_name, table_name, op):
+ """Older Mysql versions do not support DROP INDEX IF EXISTS."""
+ op.execute(f"""
+ set @var=if((SELECT true FROM information_schema.TABLE_CONSTRAINTS
WHERE
+ CONSTRAINT_SCHEMA = DATABASE() AND
+ TABLE_NAME = '{table_name}' AND
+ CONSTRAINT_NAME = '{index_name}' AND
+ CONSTRAINT_TYPE = 'INDEX') = true,'ALTER TABLE {table_name}
+ DROP INDEX {index_name}','select 1');
+
+ prepare stmt from @var;
Review Comment:
same as https://github.com/apache/airflow/pull/44790/files#r1884311558
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