org.apache.hadoop.hive.metastore.parser

Class ExpressionTree.LeafNode

java.lang.Object

org.apache.hadoop.hive.metastore.parser.ExpressionTree.TreeNode

org.apache.hadoop.hive.metastore.parser.ExpressionTree.LeafNode

Enclosing class:

ExpressionTree

public static class ExpressionTree.LeafNode
extends ExpressionTree.TreeNode

The Class representing the leaf level nodes in the ExpressionTree.

Field Summary

Fields

Modifier and Type	Field and Description
boolean	isReverseOrder
java.lang.String	keyName
ExpressionTree.Operator	operator
java.lang.Object	value Constant expression side of the operator.

Constructor Summary

Constructors

Constructor and Description
LeafNode()

Method Summary

Modifier and Type	Method and Description
void	accept(ExpressionTree.TreeVisitor visitor) Double dispatch for TreeVisitor.
java.lang.String	generateJDOFilter(Table table, java.util.Map<java.lang.String,java.lang.Object> params) Generates a JDO filter statement
java.lang.String	getFilterPushdownParam(Table table, int partColIndex) Validates and gets the query parameter for filter pushdown based on the column and the constant stored in this node.
int	getPartColIndexForFilter(Table table) Get partition column index in the table partition column list that corresponds to the key that is being filtered on by this tree node.

Methods inherited from class org.apache.hadoop.hive.metastore.parser.ExpressionTree.TreeNode

getAndOr, getLhs, getRhs

Methods inherited from class java.lang.Object

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

Field Detail

keyName

public java.lang.String keyName

operator

public ExpressionTree.Operator operator

value

public java.lang.Object value

Constant expression side of the operator. Can currently be a String or a Long.

isReverseOrder

public boolean isReverseOrder

Constructor Detail

LeafNode

public LeafNode()

Method Detail

accept

public void accept(ExpressionTree.TreeVisitor visitor)
            throws MetaException

Description copied from class: ExpressionTree.TreeNode

Double dispatch for TreeVisitor.

Overrides:

accept in class ExpressionTree.TreeNode

Throws:

MetaException

generateJDOFilter

public java.lang.String generateJDOFilter(Table table,
                                          java.util.Map<java.lang.String,java.lang.Object> params)
                                   throws MetaException

Description copied from class: ExpressionTree.TreeNode

Generates a JDO filter statement

Overrides:

generateJDOFilter in class ExpressionTree.TreeNode

Parameters:

table - The table on which the filter is applied. If table is not null, then this method generates a JDO statement to get all partitions of the table that match the filter. If table is null, then this method generates a JDO statement to get all tables that match the filter.

params - A map of parameter key to values for the filter statement.

Returns:

a JDO filter statement

Throws:

MetaException

getPartColIndexForFilter

public int getPartColIndexForFilter(Table table)
                             throws MetaException

Get partition column index in the table partition column list that corresponds to the key that is being filtered on by this tree node.

Parameters:

table - The table.

Returns:

The index.

Throws:

MetaException

getFilterPushdownParam

public java.lang.String getFilterPushdownParam(Table table,
                                               int partColIndex)
                                        throws MetaException

Validates and gets the query parameter for filter pushdown based on the column and the constant stored in this node. In future this may become different for SQL and JDOQL filter pushdown.

Parameters:

table - The table.

partColIndex - The index of the column to check.

Returns:

The parameter string.

Throws:

MetaException