dongjoon-hyun commented on a change in pull request #24809: [SPARK-21136][SQL]
Fix confusing parsing error due to problematic antlr grammer for Hive-style
single-from statements
URL: https://github.com/apache/spark/pull/24809#discussion_r291383774
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File path: docs/sql-migration-guide-upgrade.md
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@@ -23,6 +23,7 @@ license: |
{:toc}
## Upgrading From Spark SQL 2.4 to 3.0
+ - In Spark version 2.4 and earlier, SQL queries such as `FROM test` or `FROM
test UNION ALL FROM test` are supported by accident. In hive-style `FROM test
SELECT *`, the `SELECT` clause is not negligible. Therefore we will treat these
queries as invalid since Spark 3.0.
Review comment:
Actually, this is bigger than the error message changing because the old
existing customer queries will not work.
How about making this as a PR title? Something like `Disallow FROM-only SQL
statement`.
How do you think about this, @gatorsmile ?
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