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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/04/24 13:52:24 UTC
[GitHub] [flink] twalthr opened a new pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
twalthr opened a new pull request #11904:
URL: https://github.com/apache/flink/pull/11904
## What is the purpose of the change
Enables support for untyped NULL literals in function calls. The null type remains a helper type. We don't expose this type through the DDL or allow it as a function return type. It will not be used during runtime for serialization. The PR might not cover all cases, entry points of NULL into the type factory should be avoided.
## Brief change log
- Don't allow a NULL type during type generalization
- Generate a null literal for FLIP-65 functions
## Verifying this change
This change added tests and can be verified as follows: `FunctionITCase`, `NullTypeTest`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with `@Public(Evolving)`: yes
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? (yes / no)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
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[GitHub] [flink] flinkbot edited a comment on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619033904
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## CI report:
* 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 Travis: [PENDING](https://travis-ci.com/github/flink-ci/flink/builds/161842553) Azure: [PENDING](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=210)
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[GitHub] [flink] flinkbot commented on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619033904
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## CI report:
* 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 UNKNOWN
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[GitHub] [flink] flinkbot commented on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619025424
Thanks a lot for your contribution to the Apache Flink project. I'm the @flinkbot. I help the community
to review your pull request. We will use this comment to track the progress of the review.
## Automated Checks
Last check on commit 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 (Fri Apr 24 13:55:12 UTC 2020)
**Warnings:**
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## Review Progress
* ❓ 1. The [description] looks good.
* ❓ 2. There is [consensus] that the contribution should go into to Flink.
* ❓ 3. Needs [attention] from.
* ❓ 4. The change fits into the overall [architecture].
* ❓ 5. Overall code [quality] is good.
Please see the [Pull Request Review Guide](https://flink.apache.org/contributing/reviewing-prs.html) for a full explanation of the review process.<details>
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[GitHub] [flink] flinkbot edited a comment on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619033904
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## CI report:
* 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 Travis: [SUCCESS](https://travis-ci.com/github/flink-ci/flink/builds/161842553) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=210)
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[GitHub] [flink] dawidwys edited a comment on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
dawidwys edited a comment on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-620110133
Generally +1 for the changes. It enables new use cases without disabling any current ones. It does put some restrictions on a few cases we might want to support in the future. We can revisit it later though.
Could we add a few test cases that we might want to consider in the future:
```
"SELECT * FROM (VALUES (1, NULL), (2, 1)) AS T(a, b)" // should work if we enable type coercion, works already in table api
"SELECT ARRAY[1,2] IN (ARRAY[1], ARRAY[1,2], ARRAY[NULL, NULL, NULL])" // we might want to support the coercion here
```
At some point we could also support:
```
CREATE TABLE `table` (a ARRAY<STRING>);
INSERT INTO `table` SELECT ARRAY[NULL];
```
Also I found a case where it fails with a rather cryptic exception (this I think is a calcite bug)
```
"SELECT NULL IN (NULL, 1)" // this actually fails now with:
java.lang.AssertionError: to NULL from 1
at org.apache.calcite.rel.core.Values.assertRowType(Values.java:146)
at org.apache.calcite.rel.core.Values.<init>(Values.java:87)
at org.apache.calcite.rel.logical.LogicalValues.<init>(LogicalValues.java:61)
at org.apache.calcite.rel.logical.LogicalValues.create(LogicalValues.java:87)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertRowValues(SqlToRelConverter.java:1696)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQueryOrInList(SqlToRelConverter.java:1608)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertExists(SqlToRelConverter.java:1591)
at org.apache.calcite.sql2rel.SqlToRelConverter.substituteSubQuery(SqlToRelConverter.java:1158)
at org.apache.calcite.sql2rel.SqlToRelConverter.replaceSubQueries(SqlToRelConverter.java:1051)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelectList(SqlToRelConverter.java:4088)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelectImpl(SqlToRelConverter.java:685)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelect(SqlToRelConverter.java:642)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQueryRecursive(SqlToRelConverter.java:3345)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:568)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$rel(FlinkPlannerImpl.scala:155)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rel(FlinkPlannerImpl.scala:142)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.toQueryOperation(SqlToOperationConverter.java:674)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlQuery(SqlToOperationConverter.java:578)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:195)
at org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:66)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlQuery(TableEnvironmentImpl.java:588)
at org.apache.flink.table.planner.utils.TableTestUtilBase.doVerifyPlan(TableTestBase.scala:360)
at org.apache.flink.table.planner.utils.TableTestUtilBase.doVerifyPlan(TableTestBase.scala:346)
at org.apache.flink.table.planner.utils.TableTestUtilBase.verifyPlan(TableTestBase.scala:276)
at org.apache.flink.table.planner.plan.stream.sql.NullTypeTest.testBuiltInFunction(NullTypeTest.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
```
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[GitHub] [flink] twalthr commented on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
twalthr commented on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-621831627
Thanks for the review @dawidwys. I totally agree what you said. This is not the end of the NULL support story. I will create an issue for discussing enabling type coercion in Flink (either has a whole or with a limited set of use cases). I will merge this now to have at least NULL support in user-defined functions.
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[GitHub] [flink] flinkbot edited a comment on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619033904
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## CI report:
* 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 Travis: [SUCCESS](https://travis-ci.com/github/flink-ci/flink/builds/161842553) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=210)
* 481a31b3db0c152c5f4671b98c0e6a752d21b7ca UNKNOWN
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[GitHub] [flink] flinkbot edited a comment on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-619033904
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## CI report:
* 3dc410fd16c3cd8c6bce69d24d34935f8bd17c90 Travis: [PENDING](https://travis-ci.com/github/flink-ci/flink/builds/161842553) Azure: [FAILURE](https://dev.azure.com/apache-flink/98463496-1af2-4620-8eab-a2ecc1a2e6fe/_build/results?buildId=210)
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[GitHub] [flink] dawidwys commented on pull request #11904: [FLINK-17373][table] Support the NULL type for function calls
Posted by GitBox <gi...@apache.org>.
dawidwys commented on pull request #11904:
URL: https://github.com/apache/flink/pull/11904#issuecomment-620110133
Generally +1 for the changes. It enables new use cases without disabling any current ones. It does put some restrictions on a few cases we might want to support in the future. We can revisit it later though.
Could we add a few test cases that we might want to consider in the future:
```
"SELECT * FROM (VALUES (1, NULL), (2, 1)) AS T(a, b)" // should work if we enable type coercion, works already in table api
"SELECT ARRAY[1,2] IN (ARRAY[1], ARRAY[1,2], ARRAY[NULL, NULL, NULL])" // we might want to support the coercion here
```
Also I found a case where it fails with a rather cryptic exception (this I think is a calcite bug)
```
"SELECT NULL IN (NULL, 1)" // this actually fails now with:
java.lang.AssertionError: to NULL from 1
at org.apache.calcite.rel.core.Values.assertRowType(Values.java:146)
at org.apache.calcite.rel.core.Values.<init>(Values.java:87)
at org.apache.calcite.rel.logical.LogicalValues.<init>(LogicalValues.java:61)
at org.apache.calcite.rel.logical.LogicalValues.create(LogicalValues.java:87)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertRowValues(SqlToRelConverter.java:1696)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQueryOrInList(SqlToRelConverter.java:1608)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertExists(SqlToRelConverter.java:1591)
at org.apache.calcite.sql2rel.SqlToRelConverter.substituteSubQuery(SqlToRelConverter.java:1158)
at org.apache.calcite.sql2rel.SqlToRelConverter.replaceSubQueries(SqlToRelConverter.java:1051)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelectList(SqlToRelConverter.java:4088)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelectImpl(SqlToRelConverter.java:685)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertSelect(SqlToRelConverter.java:642)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQueryRecursive(SqlToRelConverter.java:3345)
at org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:568)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$rel(FlinkPlannerImpl.scala:155)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.rel(FlinkPlannerImpl.scala:142)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.toQueryOperation(SqlToOperationConverter.java:674)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlQuery(SqlToOperationConverter.java:578)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:195)
at org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:66)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlQuery(TableEnvironmentImpl.java:588)
at org.apache.flink.table.planner.utils.TableTestUtilBase.doVerifyPlan(TableTestBase.scala:360)
at org.apache.flink.table.planner.utils.TableTestUtilBase.doVerifyPlan(TableTestBase.scala:346)
at org.apache.flink.table.planner.utils.TableTestUtilBase.verifyPlan(TableTestBase.scala:276)
at org.apache.flink.table.planner.plan.stream.sql.NullTypeTest.testBuiltInFunction(NullTypeTest.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
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at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
```
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