org.apache.hadoop.hive.ql.udf.ptf

Class MatchPath.MatchPathResolver

java.lang.Object

org.apache.hadoop.hive.ql.udf.ptf.TableFunctionResolver

org.apache.hadoop.hive.ql.udf.ptf.MatchPath.MatchPathResolver

Enclosing class:

MatchPath

public static class MatchPath.MatchPathResolver
extends TableFunctionResolver

Constructor Summary

Constructors

Constructor and Description
MatchPath.MatchPathResolver()

Method Summary

Methods

Modifier and Type	Method and Description
protected TableFunctionEvaluator	createEvaluator(PTFDesc ptfDesc, PartitionedTableFunctionDef tDef)
ArrayList<String>	getOutputColumnNames()
List<String>	getReferencedColumns() Provide referenced columns names to be used in partition function
void	initializeOutputOI() This method is invoked during runtime(during deserialization of theQueryDef).
void	setupOutputOI() check structure of Arguments: First arg should be a String then there should be an even number of Arguments: String, expression; expression should be Convertible to Boolean.
boolean	transformsRawInput()

Methods inherited from class org.apache.hadoop.hive.ql.udf.ptf.TableFunctionResolver

carryForwardNames, getEvaluator, getPtfDesc, getRawInputColumnNames, initialize, initialize, initializeRawInputOI, setOutputOI, setRawInputOI, setupRawInputOI

Methods inherited from class java.lang.Object

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

Constructor Detail

MatchPath.MatchPathResolver

public MatchPath.MatchPathResolver()

Method Detail

createEvaluator

protected TableFunctionEvaluator createEvaluator(PTFDesc ptfDesc,
                                     PartitionedTableFunctionDef tDef)

Specified by:

createEvaluator in class TableFunctionResolver

setupOutputOI

public void setupOutputOI()
                   throws SemanticException

• check structure of Arguments:
  1. First arg should be a String
  2. then there should be an even number of Arguments: String, expression; expression should be Convertible to Boolean.
  3. finally there should be a String.
• convert pattern into a NNode chain.
• convert symbol args into a Symbol Map.
• parse selectList into SelectList struct. The inputOI used to translate these expressions should be based on the columns in the Input, the 'path.attr'

Specified by:

setupOutputOI in class TableFunctionResolver

Throws:

SemanticException

getReferencedColumns

public List<String> getReferencedColumns()
                                  throws SemanticException

Description copied from class: TableFunctionResolver

Provide referenced columns names to be used in partition function

Overrides:

getReferencedColumns in class TableFunctionResolver

Returns:

null for unknown (will get all columns from table including virtual columns)

Throws:

SemanticException

transformsRawInput

public boolean transformsRawInput()

Specified by:

transformsRawInput in class TableFunctionResolver

initializeOutputOI

public void initializeOutputOI()
                        throws HiveException

Description copied from class: TableFunctionResolver

This method is invoked during runtime(during deserialization of theQueryDef). At this point the TableFunction can assume that the Expression Nodes exist for all the Def (ArgDef, ColumnDef, WindowDef..). It is the responsibility of the TableFunction to construct the evaluators and setup the OI.

Specified by:

initializeOutputOI in class TableFunctionResolver

Throws:

HiveException

getOutputColumnNames

public ArrayList<String> getOutputColumnNames()

Specified by:

getOutputColumnNames in class TableFunctionResolver