Eugen Stoianovici created SPARK-47961:
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Summary: CREATE TABLE AS SELECT changes behaviour in SPARK 3.4.0
Key: SPARK-47961
URL: https://issues.apache.org/jira/browse/SPARK-47961
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.4.0
Reporter: Eugen Stoianovici
SPARK-41859 changes the behaviour for `CREATE TABLE AS SELECT ...` from
OVERWRITE to APPEND when {{spark.sql.legacy.allowNonEmptyLocationInCTAS}} is
set to {{{}true{}}}:
{{drop table if exists test_table;}}
{{create table test_table location '/tmp/test_table' stored as parquet as
select 1 as col union all select 2 as col;}}
{{drop table if exists test_table;}}
{{create table test_table location '/tmp/test_table' stored as parquet as
select 3 as col union all select 4 as col;}}
{{select * from test_table;}}
This produces {3, 4} in Spark <3.4.0 and {1, 2, 3, 4} in Spark 3.4.0 and later.
This is a silent change in {{spark.sql.legacy.allowNonEmptyLocationInCTAS}}
behaviour which introduces wrong results in the user application
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