Package io.trino.plugin.hive

Class HiveApplyProjectionUtil

java.lang.Object

io.trino.plugin.hive.HiveApplyProjectionUtil

public final class HiveApplyProjectionUtil
extends Object

Method Summary

Modifier and Type	Method	Description
static Optional<String>	find(Map<String,ColumnHandle> assignments, ApplyProjectionUtil.ProjectedColumnRepresentation projectedColumn)	Returns the assignment key corresponding to the column represented by in the , if one exists.

Methods inherited from class java.lang.Object

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

Method Details

find

public static Optional<String> find(Map<String,ColumnHandle> assignments,
 ApplyProjectionUtil.ProjectedColumnRepresentation projectedColumn)

Returns the assignment key corresponding to the column represented by in the , if one exists. The variable in the can itself be a representation of another projected column. For example, say a projected column representation has variable "x" and a dereferenceIndices=[0]. "x" can in-turn map to a projected column handle with base="a" and [1, 2] as dereference indices. Then the method searches for a column handle in with base="a" and dereferenceIndices=[1, 2, 0].