| /* |
| * 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.druid.query.expression; |
| |
| import org.apache.druid.java.util.common.IAE; |
| import org.apache.druid.java.util.common.granularity.PeriodGranularity; |
| import org.apache.druid.math.expr.Expr; |
| import org.apache.druid.math.expr.ExprEval; |
| import org.apache.druid.math.expr.ExprMacroTable; |
| import org.apache.druid.math.expr.ExpressionType; |
| import org.apache.druid.math.expr.InputBindings; |
| import org.apache.druid.math.expr.vector.CastToTypeVectorProcessor; |
| import org.apache.druid.math.expr.vector.ExprVectorProcessor; |
| import org.apache.druid.math.expr.vector.LongOutLongInFunctionVectorValueProcessor; |
| |
| import javax.annotation.Nonnull; |
| import javax.annotation.Nullable; |
| import java.util.List; |
| import java.util.Objects; |
| |
| public class TimestampFloorExprMacro implements ExprMacroTable.ExprMacro |
| { |
| private static final String FN_NAME = "timestamp_floor"; |
| |
| @Override |
| public String name() |
| { |
| return FN_NAME; |
| } |
| |
| @Override |
| public Expr apply(final List<Expr> args) |
| { |
| if (args.size() < 2 || args.size() > 4) { |
| throw new IAE("Function[%s] must have 2 to 4 arguments", name()); |
| } |
| |
| if (args.stream().skip(1).allMatch(Expr::isLiteral)) { |
| return new TimestampFloorExpr(args); |
| } else { |
| return new TimestampFloorDynamicExpr(args); |
| } |
| } |
| |
| private static PeriodGranularity computeGranularity(final List<Expr> args, final Expr.ObjectBinding bindings) |
| { |
| return ExprUtils.toPeriodGranularity( |
| args.get(1), |
| args.size() > 2 ? args.get(2) : null, |
| args.size() > 3 ? args.get(3) : null, |
| bindings |
| ); |
| } |
| |
| public static class TimestampFloorExpr extends ExprMacroTable.BaseScalarMacroFunctionExpr |
| { |
| private final PeriodGranularity granularity; |
| |
| TimestampFloorExpr(final List<Expr> args) |
| { |
| super(FN_NAME, args); |
| this.granularity = computeGranularity(args, InputBindings.nilBindings()); |
| } |
| |
| /** |
| * Exposed for Druid SQL: this is used by Expressions.toQueryGranularity. |
| */ |
| public Expr getArg() |
| { |
| return args.get(0); |
| } |
| |
| /** |
| * Exposed for Druid SQL: this is used by Expressions.toQueryGranularity. |
| */ |
| public PeriodGranularity getGranularity() |
| { |
| return granularity; |
| } |
| |
| @Nonnull |
| @Override |
| public ExprEval eval(final ObjectBinding bindings) |
| { |
| ExprEval eval = args.get(0).eval(bindings); |
| if (eval.isNumericNull()) { |
| // Return null if the argument if null. |
| return ExprEval.of(null); |
| } |
| return ExprEval.of(granularity.bucketStart(eval.asLong())); |
| } |
| |
| @Override |
| public Expr visit(Shuttle shuttle) |
| { |
| return shuttle.visit(new TimestampFloorExpr(shuttle.visitAll(args))); |
| } |
| |
| @Nullable |
| @Override |
| public ExpressionType getOutputType(InputBindingInspector inspector) |
| { |
| return ExpressionType.LONG; |
| } |
| |
| @Override |
| public boolean canVectorize(InputBindingInspector inspector) |
| { |
| return args.get(0).canVectorize(inspector); |
| } |
| |
| @Override |
| public <T> ExprVectorProcessor<T> buildVectorized(VectorInputBindingInspector inspector) |
| { |
| ExprVectorProcessor<?> processor; |
| processor = new LongOutLongInFunctionVectorValueProcessor( |
| CastToTypeVectorProcessor.cast(args.get(0).buildVectorized(inspector), ExpressionType.LONG), |
| inspector.getMaxVectorSize() |
| ) |
| { |
| @Override |
| public long apply(long input) |
| { |
| return granularity.bucketStart(input); |
| } |
| }; |
| |
| return (ExprVectorProcessor<T>) processor; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| if (!super.equals(o)) { |
| return false; |
| } |
| TimestampFloorExpr that = (TimestampFloorExpr) o; |
| return Objects.equals(granularity, that.granularity); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hash(super.hashCode(), granularity); |
| } |
| } |
| |
| public static class TimestampFloorDynamicExpr extends ExprMacroTable.BaseScalarMacroFunctionExpr |
| { |
| TimestampFloorDynamicExpr(final List<Expr> args) |
| { |
| super(FN_NAME, args); |
| } |
| |
| @Nonnull |
| @Override |
| public ExprEval eval(final ObjectBinding bindings) |
| { |
| final PeriodGranularity granularity = computeGranularity(args, bindings); |
| return ExprEval.of(granularity.bucketStart(args.get(0).eval(bindings).asLong())); |
| } |
| |
| @Override |
| public Expr visit(Shuttle shuttle) |
| { |
| return shuttle.visit(new TimestampFloorDynamicExpr(shuttle.visitAll(args))); |
| } |
| |
| @Nullable |
| @Override |
| public ExpressionType getOutputType(InputBindingInspector inspector) |
| { |
| return ExpressionType.LONG; |
| } |
| } |
| } |