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[feature] Support pre-aggregation for quantile type (#8234)

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Add a new column-type to speed up the approximation of quantiles.
1. The  new column-type is named `quantile_state` with fixed aggregation function `quantile_union`, which stores the intermediate results of pre-aggregated approximation calculations for quantiles.
2. support pre-aggregation of new column-type and quantile_state related functions.
This commit is contained in:
spaces-x
2022-03-24 09:11:34 +08:00
committed by GitHub
parent 36c85d2f06
commit bea9a7ba4f
67 changed files with 1498 additions and 153 deletions
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36
be/src/exprs/quantile_function.h Normal file
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// 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.
#pragma once
#include "udf/udf.h"
namespace doris {
class QuantileStateFunctions {
public:
static void init();
static void quantile_state_init(FunctionContext* ctx, StringVal* dst);
static void to_quantile_state_prepare(FunctionContext* ctx,
FunctionContext::FunctionStateScope scope);
static void quantile_percent_prepare(FunctionContext* ctx,
FunctionContext::FunctionStateScope scope);
static StringVal to_quantile_state(FunctionContext* ctx, const StringVal& src);
static void quantile_union(FunctionContext* ctx, const StringVal& src, StringVal* dst);
static DoubleVal quantile_percent(FunctionContext* ctx, StringVal& src);
static StringVal quantile_state_serialize(FunctionContext* ctx, const StringVal& src);
};
} // namespace doris