| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 at |
| * |
| * 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 org.apache.drill.exec.expr.fn.impl; |
| |
| import org.apache.drill.exec.expr.DrillSimpleFunc; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate; |
| import org.apache.drill.exec.expr.annotations.FunctionTemplate.NullHandling; |
| import org.apache.drill.exec.expr.annotations.Output; |
| import org.apache.drill.exec.expr.annotations.Param; |
| import org.apache.drill.exec.expr.holders.BitHolder; |
| import org.apache.drill.exec.expr.holders.NullableVarCharHolder; |
| import org.apache.drill.exec.vector.complex.reader.FieldReader; |
| |
| |
| @SuppressWarnings("unused") |
| public class IsEmptyScalarFunctions { |
| |
| private IsEmptyScalarFunctions() { |
| } |
| |
| @FunctionTemplate(names = {"isempty", "is_empty"}, |
| scope = FunctionTemplate.FunctionScope.SIMPLE) |
| public static class IsEmptyVarcharFunctions implements DrillSimpleFunc { |
| |
| @Param |
| NullableVarCharHolder input; |
| |
| @Output |
| BitHolder out; |
| |
| @Override |
| public void setup() { |
| // no op |
| } |
| |
| @Override |
| public void eval() { |
| if (input.start == 0 && input.end == 0) { |
| out.value = 1; |
| } else { |
| String data = org.apache.drill.exec.expr.fn.impl.StringFunctionHelpers.toStringFromUTF8(input.start, input.end, input.buffer); |
| out.value = org.apache.commons.lang3.StringUtils.isEmpty(data) ? 1 : 0; |
| } |
| } |
| } |
| |
| @FunctionTemplate(names = {"isempty", "is_empty"}, |
| scope = FunctionTemplate.FunctionScope.SIMPLE, |
| nulls = NullHandling.INTERNAL) |
| public static class IsEmptyMapFunctions implements DrillSimpleFunc { |
| |
| @Param |
| FieldReader input; |
| |
| @Output |
| BitHolder out; |
| |
| @Override |
| public void setup() { |
| // no op |
| } |
| |
| @Override |
| public void eval() { |
| out.value = org.apache.drill.exec.expr.fn.impl.IsEmptyUtils.mapIsEmpty(input) ? 1 : 0; |
| } |
| } |
| } |