srowen commented on a change in pull request #24788: [SPARK-26985][CORE] Fix
"access only some column of the all of columns " for big endian architecture
URL: https://github.com/apache/spark/pull/24788#discussion_r292876421
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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 <table>` or
`FROM <table> UNION ALL FROM <table>` are supported by accident. In hive-style
`FROM <table> SELECT <expr>`, the `SELECT` clause is not negligible. Neither
Hive nor Presto support this syntax. Therefore we will treat these queries as
invalid since Spark 3.0.
Review comment:
I think you included a bunch of unrelated changes. Can you revert or open a
new PR?
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