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

Class TestScanLevelProjection

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.TestScanLevelProjection

public class TestScanLevelProjection
extends SubOperatorTest

Test the level of projection done at the level of the scan as a whole; before knowledge of table "implicit" columns or the specific table schema.

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
TestScanLevelProjection()

Method Summary

Modifier and Type	Method and Description
void	testArray() Similar to maps, if the project list contains "a[1]" then we've learned that a is an array, but we don't know what type.
void	testBasics() Basic test: select a set of columns (a, b, c) when the data source has an early schema of (a, c, d).
void	testColumnAndWildcard() Test a column name and a wildcard.
void	testEmptyProjection() Test an empty projection which occurs in a SELECT COUNT(*) query.
void	testEmptyProvidedSchema()
void	testMap() Map projection occurs when a query contains project-list items with a dot, such as "a.b".
void	testNonStrictProvidedSchema() Non-strict provided schema, reader that offers an extra column, projection list includes the column.
void	testProvidedSchemaModeMismatch()
void	testProvidedSchemaTypeMismatch()
void	testProvidedSchemaWildcard()
void	testProvidedSchemaWildcardSpecialCols()
void	testStrictProvidedSchema() Strict provided schema, reader that offers an extra column, projection list includes the column.
void	testStrictProvidedSchemaWildcard() Wildcard projection with a strict schema is the same as a non-strict schema, except that the projection type is different.
void	testTwoWildcards() Wildcard included twice is benign
void	testWildcard() Simulate a SELECT * query by passing "**" (Drill's internal representation of the wildcard) as a column name.
void	testWildcardAndColumns() Can include both a wildcard and a column name.

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

TestScanLevelProjection

public TestScanLevelProjection()

Method Detail

testBasics

public void testBasics()

Basic test: select a set of columns (a, b, c) when the data source has an early schema of (a, c, d). (a, c) are projected, (d) is null.

testMap

public void testMap()

Map projection occurs when a query contains project-list items with a dot, such as "a.b". We may not know the type of "b", but have just learned that "a" must be a map.

testArray

public void testArray()

Similar to maps, if the project list contains "a[1]" then we've learned that a is an array, but we don't know what type.

testWildcard

public void testWildcard()

Simulate a SELECT * query by passing "**" (Drill's internal representation of the wildcard) as a column name.

testEmptyProjection

public void testEmptyProjection()

Test an empty projection which occurs in a SELECT COUNT(*) query.

testWildcardAndColumns

public void testWildcardAndColumns()

Can include both a wildcard and a column name. The Project operator will fill in the column, the scan framework just ignores the extra column.

testColumnAndWildcard

public void testColumnAndWildcard()

Test a column name and a wildcard.

testTwoWildcards

public void testTwoWildcards()

Wildcard included twice is benign

Note: Drill actually allows this, but the work should be done in the project operator; scan should see at most one wildcard.

testEmptyProvidedSchema

public void testEmptyProvidedSchema()

testProvidedSchemaWildcard

public void testProvidedSchemaWildcard()

testProvidedSchemaWildcardSpecialCols

public void testProvidedSchemaWildcardSpecialCols()

testStrictProvidedSchemaWildcard

public void testStrictProvidedSchemaWildcard()

Wildcard projection with a strict schema is the same as a non-strict schema, except that the projection type is different.

testProvidedSchemaTypeMismatch

public void testProvidedSchemaTypeMismatch()

testProvidedSchemaModeMismatch

public void testProvidedSchemaModeMismatch()

testNonStrictProvidedSchema

public void testNonStrictProvidedSchema()

Non-strict provided schema, reader that offers an extra column, projection list includes the column.

testStrictProvidedSchema

public void testStrictProvidedSchema()

Strict provided schema, reader that offers an extra column, projection list includes the column. However, column is not projected for reader.