gatorsmile 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_r291385758
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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:
Yeah. I think we can highlight it in the PR title. Also, the original
motivation of this PR is to resolve the long standing and confusing error
messages issued by our parser.
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