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

Class TestReaderLevelProjection

java.lang.Object

org.apache.drill.test.BaseTest

org.apache.drill.test.DrillTest

org.apache.drill.test.SubOperatorTest

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

public class TestReaderLevelProjection
extends SubOperatorTest

"Schema level projection" describes one side of the projection mechanism. When we project, we have the set of column the user wants "the schema level" and the set of columns on offer from the data source "the scan level." The projection mechanism combines these to map out the actual projection.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.test.DrillTest

DrillTest.MemWatcher

Field Summary

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

dirTestWatcher, fixture

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

logOutcome, objectMapper, REPEAT_RULE, thrownException, TIMEOUT

Constructor Summary

Constructors

Constructor and Description
TestReaderLevelProjection()

Method Summary

Modifier and Type	Method and Description
void	testArrayMismatch() Project of a non-array as an array
void	testArrayProject() Test project of an array.
void	testDisjoint() Drill is unique in that we can select (a, b) from a data source that only offers (c, d).
void	testFullList() Test SELECT list with columns defined in a order and with name case different than the early-schema table.
void	testMapMismatch() Project of a non-map as a map
void	testMissing() Test SELECT list with columns missing from the table schema.
void	testOmittedMap() Test the obscure case that the data source contains a map, but we project only one of the members of the map.
void	testOmittedMapMembers() Test of a map with missing columns.
void	testSimpleMapProject() Simple map project.
void	testSubset() Test an explicit projection (providing columns) in which the names in the project lists are a different case than the data source, the order of columns differs, and we ask for a subset of data source columns.
void	testWildcard() Test wildcard projection: take all columns on offer from the data source, in the order that the data source specifies.
void	testWildcardWithSchema() Non-strict metadata schema.
void	testWildcardWithStrictSchema() Strict metadata schema.

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

classSetup, classTeardown

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

escapeJsonString, finishDrillTest, initDrillTest

Methods inherited from class java.lang.Object

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

Constructor Detail

TestReaderLevelProjection

public TestReaderLevelProjection()

Method Detail

testWildcard

public void testWildcard()

Test wildcard projection: take all columns on offer from the data source, in the order that the data source specifies.

testFullList

public void testFullList()

Test SELECT list with columns defined in a order and with name case different than the early-schema table.

testMissing

public void testMissing()

Test SELECT list with columns missing from the table schema.

testSubset

public void testSubset()

Test an explicit projection (providing columns) in which the names in the project lists are a different case than the data source, the order of columns differs, and we ask for a subset of data source columns.

testDisjoint

public void testDisjoint()

Drill is unique in that we can select (a, b) from a data source that only offers (c, d). We get null columns as a result.

testOmittedMap

public void testOmittedMap()

Test the obscure case that the data source contains a map, but we project only one of the members of the map. The output should be a map that contains only the members we request.

testOmittedMapMembers

public void testOmittedMapMembers()

Test of a map with missing columns. table of (a{b, c}), project a.c, a.d, a.e.f

testSimpleMapProject

public void testSimpleMapProject()

Simple map project. This is an internal case in which the query asks for a set of columns inside a map, and the table loader produces exactly that set. No special projection is needed, the map is projected as a whole.

testMapMismatch

public void testMapMismatch()

Project of a non-map as a map

testArrayProject

public void testArrayProject()

Test project of an array. At the scan level, we just verify that the requested column is, indeed, an array.

testArrayMismatch

public void testArrayMismatch()

Project of a non-array as an array

testWildcardWithSchema

public void testWildcardWithSchema()

Non-strict metadata schema. Projects all schema columns followed by any "extra" reader columns.

testWildcardWithStrictSchema

public void testWildcardWithStrictSchema()

Strict metadata schema. Projects output the output schema columns; ignores other reader columns.