org.apache.drill.exec.physical.impl.scan

Class TestScanOperExecLimit

java.lang.Object

DrillTest

org.apache.drill.test.SubOperatorTest

org.apache.drill.exec.physical.impl.scan.BaseScanOperatorExecTest

org.apache.drill.exec.physical.impl.scan.TestScanOperExecLimit

public class TestScanOperExecLimit
extends BaseScanOperatorExecTest

Verifies that the V1 scan framework properly pushes the LIMIT into the scan by stopping the scan once any reader produces the rows up to the limit. Verifies that the result set loader enforces the limit at the batch level, that the reader lifecycle enforces limits at the reader level, and that the scan framework enforces limits at by skipping over unneeded readers.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	TestScanOperExecLimit.Mock50RowReader Mock reader that returns two 50-row batches.

Nested classes/interfaces inherited from class org.apache.drill.exec.physical.impl.scan.BaseScanOperatorExecTest

BaseScanOperatorExecTest.BaseMockBatchReader, BaseScanOperatorExecTest.BaseScanFixtureBuilder, BaseScanOperatorExecTest.MockEarlySchemaReader

Field Summary

Fields inherited from class org.apache.drill.test.SubOperatorTest

dirTestWatcher, fixture

Constructor Summary

Constructors

Constructor and Description
TestScanOperExecLimit()

Method Summary

Modifier and Type	Method and Description
void	testLimit0() LIMIT 0, to obtain only the schema.
void	testLimit1() LIMIT 1, simplest case
void	testLimitOnBatchEnd() LIMIT 50, same as batch size, to check boundary conditions.
void	testLimitOnEOF() LIMIT 100, at EOF of the first reader.
void	testLimitOnScondBatch() LIMIT 75, halfway through second batch.
void	testLimitOnSecondReader() LIMIT 125: full first reader, limit on second

Methods inherited from class org.apache.drill.exec.physical.impl.scan.BaseScanOperatorExecTest

expectedSchema, makeExpected, makeExpected, simpleBuilder, simpleFixture, verifyBatch

Methods inherited from class org.apache.drill.test.SubOperatorTest

classSetup, classTeardown

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TestScanOperExecLimit

public TestScanOperExecLimit()

Method Detail

testLimit0

public void testLimit0()

LIMIT 0, to obtain only the schema.

testLimit1

public void testLimit1()

LIMIT 1, simplest case

testLimitOnBatchEnd

public void testLimitOnBatchEnd()

LIMIT 50, same as batch size, to check boundary conditions.

testLimitOnScondBatch

public void testLimitOnScondBatch()

LIMIT 75, halfway through second batch.

testLimitOnEOF

public void testLimitOnEOF()

LIMIT 100, at EOF of the first reader.

testLimitOnSecondReader

public void testLimitOnSecondReader()

LIMIT 125: full first reader, limit on second