| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package edu.uci.ics.hivesterix.runtime.factory.evaluator;
|
|
|
| import org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc;
|
|
|
| import edu.uci.ics.hivesterix.logical.expression.ExpressionTranslator;
|
| import edu.uci.ics.hivesterix.runtime.evaluator.ConstantExpressionEvaluator;
|
| import edu.uci.ics.hivesterix.runtime.jobgen.Schema;
|
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
|
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression;
|
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
|
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator;
|
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory;
|
| import edu.uci.ics.hyracks.data.std.api.IDataOutputProvider;
|
|
|
| public class ConstantExpressionEvaluatorFactory implements ICopyEvaluatorFactory {
|
|
|
| private static final long serialVersionUID = 1L;
|
|
|
| private ExprNodeConstantDesc expr;
|
|
|
| private Schema schema;
|
|
|
| public ConstantExpressionEvaluatorFactory(ILogicalExpression expression, Schema inputSchema,
|
| IVariableTypeEnvironment env) throws AlgebricksException {
|
| try {
|
| expr = (ExprNodeConstantDesc) ExpressionTranslator.getHiveExpression(expression, env);
|
| } catch (Exception e) {
|
| throw new AlgebricksException(e.getMessage());
|
| }
|
| schema = inputSchema;
|
| }
|
|
|
| public ICopyEvaluator createEvaluator(IDataOutputProvider output) throws AlgebricksException {
|
| return new ConstantExpressionEvaluator(expr, schema.toObjectInspector(), output);
|
| }
|
|
|
| public String toString() {
|
| return "constant expression evaluator factory: " + expr.toString();
|
| }
|
|
|
| }
|