[SPARK-48759][SQL] Add migration doc for CREATE TABLE AS SELECT behavior change behavior change since Spark 3.4 (branch-3.5) #47178
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cc @cloud-fan |
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thanks, merging to 3.5/3.4! |
cloud-fan
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…ior change behavior change since Spark 3.4 (branch-3.5) ### What changes were proposed in this pull request? This PR is a follow-up to #47152 against `branch-3.5`. Add migration guide for `CREATE TABLE AS SELECT...` behavior change. 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. ### Why are the changes needed? This documents a behavior change starting in Spark 3.4 for `CREATE TABLE AS SELECT` ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? `doc build ` ### Was this patch authored or co-authored using generative AI tooling? No. Closes #47178 from asl3/allowNonEmptyLocationInCTAS-3.5. Authored-by: Amanda Liu <[email protected]> Signed-off-by: Wenchen Fan <[email protected]>
cloud-fan
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Jul 2, 2024
…ior change behavior change since Spark 3.4 (branch-3.5) ### What changes were proposed in this pull request? This PR is a follow-up to #47152 against `branch-3.5`. Add migration guide for `CREATE TABLE AS SELECT...` behavior change. 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. ### Why are the changes needed? This documents a behavior change starting in Spark 3.4 for `CREATE TABLE AS SELECT` ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? `doc build ` ### Was this patch authored or co-authored using generative AI tooling? No. Closes #47178 from asl3/allowNonEmptyLocationInCTAS-3.5. Authored-by: Amanda Liu <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit ef4e456) Signed-off-by: Wenchen Fan <[email protected]>
gaecoli
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Jul 10, 2024
…ior change behavior change since Spark 3.4 (branch-3.5) ### What changes were proposed in this pull request? This PR is a follow-up to apache#47152 against `branch-3.5`. Add migration guide for `CREATE TABLE AS SELECT...` behavior change. 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. ### Why are the changes needed? This documents a behavior change starting in Spark 3.4 for `CREATE TABLE AS SELECT` ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? `doc build ` ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#47178 from asl3/allowNonEmptyLocationInCTAS-3.5. Authored-by: Amanda Liu <[email protected]> Signed-off-by: Wenchen Fan <[email protected]>
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What changes were proposed in this pull request?
This PR is a follow-up to #47152 against
branch-3.5.Add migration guide for
CREATE TABLE AS SELECT...behavior change.SPARK-41859 changes the behaviour for
CREATE TABLE AS SELECT ...from OVERWRITE to APPEND whenspark.sql.legacy.allowNonEmptyLocationInCTASis set totrue: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.allowNonEmptyLocationInCTASbehaviour which introduces wrong results in the user application.Why are the changes needed?
This documents a behavior change starting in Spark 3.4 for
CREATE TABLE AS SELECTDoes this PR introduce any user-facing change?
No.
How was this patch tested?
doc buildWas this patch authored or co-authored using generative AI tooling?
No.