string column handling for long/float min/max/sum aggregators

[himanshug]

Fixes #8148

Same as #8243 but for long/float min/max/sum aggregators

Description

This patch adds handling of single/multi value column handling by long/float sum/min/max aggregators to do a best effort parsing string as long/float.

StringColumn[Long/Float]AggregatorWrapper and StringColumn[Long/Float]BufferAggregatorWrapper classes are introduced that can wrap existing long/float aggregators to handle string columns. Both of the classes are used by Simple[Long/Float]AggregatorFactory to be used when input column is known to be of String type.

---

This PR has:

• been self-reviewed.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added unit tests or modified existing tests to cover new code paths.

[jihoonson]

@himanshug I will take a look probably sometime this week. In the meantime, would you check the CI failure? It looks legit.

[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.029 s <<< FAILURE! - in org.apache.druid.query.groupby.epinephelinae.ParallelCombinerTest
[ERROR] testCombine(org.apache.druid.query.groupby.epinephelinae.ParallelCombinerTest)  Time elapsed: 0.02 s  <<< ERROR!
java.lang.UnsupportedOperationException
	at org.apache.druid.query.groupby.epinephelinae.ParallelCombiner$SettableColumnSelectorFactory.getColumnCapabilities(ParallelCombiner.java:502)
	at org.apache.druid.query.aggregation.SimpleLongAggregatorFactory.shouldUseStringColumnAggregatorWrapper(SimpleLongAggregatorFactory.java:222)
	at org.apache.druid.query.aggregation.SimpleLongAggregatorFactory.factorizeBuffered(SimpleLongAggregatorFactory.java:97)
	at org.apache.druid.query.aggregation.SimpleLongAggregatorFactory.factorizeBuffered(SimpleLongAggregatorFactory.java:48)
	at org.apache.druid.query.aggregation.NullableAggregatorFactory.factorizeBuffered(NullableAggregatorFactory.java:52)
	at org.apache.druid.query.groupby.epinephelinae.StreamingMergeSortedGrouper.<init>(StreamingMergeSortedGrouper.java:145)
	at org.apache.druid.query.groupby.epinephelinae.ParallelCombiner.runCombiner(ParallelCombiner.java:392)
	at org.apache.druid.query.groupby.epinephelinae.ParallelCombiner.buildCombineTree(ParallelCombiner.java:348)
	at org.apache.druid.query.groupby.epinephelinae.ParallelCombiner.combine(ParallelCombiner.java:164)
	at org.apache.druid.query.groupby.epinephelinae.ParallelCombinerTest.testCombine(ParallelCombinerTest.java:117)
	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.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.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runners.Suite.runChild(Suite.java:128)
	at org.junit.runners.Suite.runChild(Suite.java:27)
	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.apache.maven.surefire.junitcore.JUnitCore.run(JUnitCore.java:55)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:137)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeEager(JUnitCoreWrapper.java:107)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:83)
	at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:75)
	at org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:158)
	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)

[himanshug]

@jihoonson thanks, I will fix the build tomorrow.

[himanshug]

@jihoonson fyi: build is actually fixed , coveralls failure is unrelated.

[jihoonson]

Oh sorry. Forgot about this PR. Will take a look this week.

[clintropolis]

lgtm 👍

[himanshug]

@clintropolis thanks for the review

@jihoonson you can skip this one as the changes here are simple and don't need multiple reviews. there will be more PRs soon, so save yourself some time :)

[jihoonson]

@himanshug cool, I will try to review your follow-up prs!