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 projectedColumn in the assignments, 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 projectedColumn in the assignments, if one exists. The variable in the projectedColumn 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 assignments with base="a" and dereferenceIndices=[1, 2, 0].