Package org.apache.drill.exec.planner.sql.handlers

Class DescribeTableHandler

java.lang.Object

org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler

org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

org.apache.drill.exec.planner.sql.handlers.DescribeTableHandler

public class DescribeTableHandler
extends DefaultSqlHandler

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

DefaultSqlHandler.ConvertedRelNode, DefaultSqlHandler.MetaDataProviderModifier

Field Summary

Fields inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

config, context

Constructor Summary

Constructors

Constructor	Description
DescribeTableHandler(SqlHandlerConfig config)

Method Summary

Modifier and Type	Method	Description
org.apache.calcite.sql.SqlNode	rewrite(org.apache.calcite.sql.SqlNode sqlNode)	Rewrite the parse tree as SELECT ...
protected org.apache.calcite.util.Pair<org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType>	validateNode(org.apache.calcite.sql.SqlNode sqlNode)

Methods inherited from class org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler

addRenamedProject, convertToDrel, convertToPlan, convertToPop, convertToPrel, convertToRawDrel, getPlan, getPops, log, log, log, logAndSetTextPlan, transform, transform, validateAndConvert

Methods inherited from class org.apache.drill.exec.planner.sql.handlers.AbstractSqlHandler

unwrap

Methods inherited from class java.lang.Object

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

Constructor Details

DescribeTableHandler

public DescribeTableHandler(SqlHandlerConfig config)

Method Details

rewrite

public org.apache.calcite.sql.SqlNode rewrite(org.apache.calcite.sql.SqlNode sqlNode)
                                       throws ForemanSetupException

Rewrite the parse tree as SELECT ... FROM INFORMATION_SCHEMA.COLUMNS ...

Overrides:

rewrite in class DefaultSqlHandler

Parameters:

sqlNode - sql parse tree to be rewritten

Returns:

Rewritten sql parse tree

Throws:

ForemanSetupException

validateNode

protected org.apache.calcite.util.Pair<org.apache.calcite.sql.SqlNode,org.apache.calcite.rel.type.RelDataType> validateNode(org.apache.calcite.sql.SqlNode sqlNode)
                                                                                                                     throws org.apache.calcite.tools.ValidationException,
org.apache.calcite.tools.RelConversionException,
ForemanSetupException

Overrides:

validateNode in class DefaultSqlHandler

Throws:

org.apache.calcite.tools.ValidationException

org.apache.calcite.tools.RelConversionException

ForemanSetupException