[SPARK-33591][SQL][3.0] Recognize null in partition spec values
#31095
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1. Recognize `null` while parsing partition specs, and put `null` instead of `"null"` as partition values. 2. For V1 catalog: replace `null` by `__HIVE_DEFAULT_PARTITION__`. 3. For V2 catalogs: pass `null` AS IS, and let catalog implementations to decide how to handle `null`s as partition values in spec. Currently, `null` in partition specs is recognized as the `"null"` string which could lead to incorrect results, for example: ```sql spark-sql> CREATE TABLE tbl5 (col1 INT, p1 STRING) USING PARQUET PARTITIONED BY (p1); spark-sql> INSERT INTO TABLE tbl5 PARTITION (p1 = null) SELECT 0; spark-sql> SELECT isnull(p1) FROM tbl5; false ``` Even we inserted a row to the partition with the `null` value, **the resulted table doesn't contain `null`**. Yes. After the changes, the example above works as expected: ```sql spark-sql> SELECT isnull(p1) FROM tbl5; true ``` 1. By running the affected test suites `SQLQuerySuite`, `AlterTablePartitionV2SQLSuite` and `v1/ShowPartitionsSuite`. 2. Compiling by Scala 2.13: ``` $ ./dev/change-scala-version.sh 2.13 $ ./build/sbt -Pscala-2.13 compile ``` Closes apache#30538 from MaxGekk/partition-spec-value-null. Authored-by: Max Gekk <[email protected]> Signed-off-by: Wenchen Fan <[email protected]> (cherry picked from commit 157b72a) Signed-off-by: Max Gekk <[email protected]>
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### What changes were proposed in this pull request? 1. Recognize `null` while parsing partition specs, and put `null` instead of `"null"` as partition values. 2. For V1 catalog: replace `null` by `__HIVE_DEFAULT_PARTITION__`. ### Why are the changes needed? Currently, `null` in partition specs is recognized as the `"null"` string which could lead to incorrect results, for example: ```sql spark-sql> CREATE TABLE tbl5 (col1 INT, p1 STRING) USING PARQUET PARTITIONED BY (p1); spark-sql> INSERT INTO TABLE tbl5 PARTITION (p1 = null) SELECT 0; spark-sql> SELECT isnull(p1) FROM tbl5; false ``` Even we inserted a row to the partition with the `null` value, **the resulted table doesn't contain `null`**. ### Does this PR introduce _any_ user-facing change? Yes. After the changes, the example above works as expected: ```sql spark-sql> SELECT isnull(p1) FROM tbl5; true ``` ### How was this patch tested? By running the affected test suites: ``` $ build/sbt -Phive -Phive-thriftserver "test:testOnly *SQLQuerySuite" $ build/sbt -Phive -Phive-thriftserver "test:testOnly *CatalogedDDLSuite" ``` Authored-by: Max Gekk <max.gekkgmail.com> Signed-off-by: Wenchen Fan <wenchendatabricks.com> (cherry picked from commit 157b72a) Signed-off-by: Max Gekk <max.gekkgmail.com> Closes #31095 from MaxGekk/partition-spec-value-null-3.0. Authored-by: Max Gekk <[email protected]> Signed-off-by: Wenchen Fan <[email protected]>
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thanks, merging to 3.0! |
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What changes were proposed in this pull request?
nullwhile parsing partition specs, and putnullinstead of"null"as partition values.nullby__HIVE_DEFAULT_PARTITION__.Why are the changes needed?
Currently,
nullin partition specs is recognized as the"null"string which could lead to incorrect results, for example:Even we inserted a row to the partition with the
nullvalue, the resulted table doesn't containnull.Does this PR introduce any user-facing change?
Yes. After the changes, the example above works as expected:
How was this patch tested?
By running the affected test suites:
Authored-by: Max Gekk [email protected]
Signed-off-by: Wenchen Fan [email protected]
(cherry picked from commit 157b72a)
Signed-off-by: Max Gekk [email protected]