ktmud commented on code in PR #20936:
URL: https://github.com/apache/superset/pull/20936#discussion_r936086818
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superset/migrations/versions/2022-07-07_13-00_c747c78868b6_migrating_legacy_treemap.py:
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@@ -29,6 +32,14 @@
def upgrade():
+ # Ensure `slice.params` and `slice.query_context`` in MySQL is MEDIUMTEXT
+ # before migration, as the migration will save a duplicate form_data backup
+ # which may significantly increase the size of these fields.
+ if isinstance(op.get_bind().dialect, MySQLDialect):
+ # If the columns are already MEDIUMTEXT, this is a no-op
+ op.execute("ALTER TABLE slices MODIFY params MEDIUMTEXT")
Review Comment:
Because this is only for one dialect and raw SQL is easier to read. People
can also copy the statement directly if they ever want to test it manually.
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