[jira] [Created] (CALCITE-3278) Simplify the use to translate RexNode to Expression for evaluating

["Wang Yanlin (Jira)" <ji...@apache.org>]

Wang Yanlin created CALCITE-3278:
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             Summary: Simplify the use to translate RexNode to Expression for evaluating
                 Key: CALCITE-3278
                 URL: https://issues.apache.org/jira/browse/CALCITE-3278
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Wang Yanlin


 The method *forAggregation* of *RexToLixTranslator*  is designed to work for translating aggregate functions, with some parameters that we actually do not need, if we just want to translate a single RexNode. 
We lack a more common sense function to get an instance of RexToLixTranslator. 
And, the translated expression is a *ParameterExpression*, not fit for evaluating. When evaluating, we get an exception like this

{code:java}
java.lang.RuntimeException: parameter v not on stack

	at org.apache.calcite.linq4j.tree.Evaluator.peek(Evaluator.java:51)
	at org.apache.calcite.linq4j.tree.ParameterExpression.evaluate(ParameterExpression.java:55)
	at org.apache.calcite.linq4j.tree.GotoStatement.evaluate(GotoStatement.java:97)
	at org.apache.calcite.linq4j.tree.BlockStatement.evaluate(BlockStatement.java:83)
	at org.apache.calcite.linq4j.tree.Evaluator.evaluate(Evaluator.java:55)
	at org.apache.calcite.linq4j.tree.FunctionExpression.lambda$compile$0(FunctionExpression.java:87)
	at org.apache.calcite.adapter.enumerable.RexToLixTranslatorTest.testRawTranslateRexNode(RexToLixTranslatorTest.java:57)
	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$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
{code}




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