org.apache.spark.sql.hive

Class HiveQl.TransformableNode

Object

org.apache.spark.sql.hive.HiveQl.TransformableNode

Enclosing class:

HiveQl

public static class HiveQl.TransformableNode
extends Object

A set of implicit transformations that allow Hive ASTNodes to be rewritten by transformations similar to catalyst.trees.TreeNode.

Note that this should be considered very experimental and is not indented as a replacement for TreeNode. Primarily it should be noted ASTNodes are not immutable and do not appear to have clean copy semantics. Therefore, users of this class should take care when copying/modifying trees that might be used elsewhere.

Constructor Summary

Constructors

Constructor and Description
HiveQl.TransformableNode(org.apache.hadoop.hive.ql.parse.ASTNode n)

Method Summary

Methods

Modifier and Type	Method and Description
void	checkEquals(org.apache.hadoop.hive.ql.parse.ASTNode other) Throws an error if this is not equal to other.
org.apache.hadoop.hive.ql.parse.ASTNode	transform(scala.PartialFunction<org.apache.hadoop.hive.ql.parse.ASTNode,org.apache.hadoop.hive.ql.parse.ASTNode> rule) Returns a copy of this node where rule has been recursively applied to it and all of its children.
org.apache.hadoop.hive.ql.parse.ASTNode	withChildren(scala.collection.Seq<org.apache.hadoop.hive.ql.parse.ASTNode> newChildren) Returns this ASTNode with the children changed to newChildren.
org.apache.hadoop.hive.ql.parse.ASTNode	withText(String newText) Returns this ASTNode with the text changed to newText.

Methods inherited from class Object

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

Constructor Detail

HiveQl.TransformableNode

public HiveQl.TransformableNode(org.apache.hadoop.hive.ql.parse.ASTNode n)

Method Detail

transform

public org.apache.hadoop.hive.ql.parse.ASTNode transform(scala.PartialFunction<org.apache.hadoop.hive.ql.parse.ASTNode,org.apache.hadoop.hive.ql.parse.ASTNode> rule)

Returns a copy of this node where rule has been recursively applied to it and all of its children. When rule does not apply to a given node it is left unchanged.

Parameters:

rule - the function use to transform this nodes children

withText

public org.apache.hadoop.hive.ql.parse.ASTNode withText(String newText)

Returns this ASTNode with the text changed to newText.

withChildren

public org.apache.hadoop.hive.ql.parse.ASTNode withChildren(scala.collection.Seq<org.apache.hadoop.hive.ql.parse.ASTNode> newChildren)

Returns this ASTNode with the children changed to newChildren.

checkEquals

public void checkEquals(org.apache.hadoop.hive.ql.parse.ASTNode other)

Throws an error if this is not equal to other.

Right now this function only checks the name, type, text and children of the node for equality.