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 /*
  * 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 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 com.facebook.presto.operator.aggregation;
import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.util.Failures.checkCondition;
import static com.google.common.base.Preconditions.checkState;
@AggregationFunction("approx_percentile")
    public static void input(DigestAndPercentileState state, @SqlType(.double value, @SqlType(.double percentile)
    {
        ApproximateLongPercentileAggregations.input(statedoubleToSortableLong(value), percentile);
    }
    public static void weightedInput(DigestAndPercentileState state, @SqlType(.double value, @SqlType(.long weight, @SqlType(.double percentile)
    {
        ApproximateLongPercentileAggregations.weightedInput(statedoubleToSortableLong(value), weightpercentile);
    }
    public static void combine(DigestAndPercentileState stateDigestAndPercentileState otherState)
    {
        ApproximateLongPercentileAggregations.combine(stateotherState);
    }
    public static void output(DigestAndPercentileState stateBlockBuilder out)
    {
        QuantileDigest digest = state.getDigest();
        double percentile = state.getPercentile();
        if (digest == null || digest.getCount() == 0.0) {
            out.appendNull();
        }
        else {
            checkState(percentile != -1.0, "Percentile is missing");
            checkCondition(0 <= percentile && percentile <= 1, "Percentile must be between 0 and 1");
            .writeDouble(outlongToDouble(digest.getQuantile(percentile)));
        }
    }
    private static double longToDouble(long value)
    {
        if (value < 0) {
            value ^= 0x7fffffffffffffffL;
        }
        return Double.longBitsToDouble(value);
    }
    private static long doubleToSortableLong(double value)
    {
        long result = Double.doubleToRawLongBits(value);
        if (result < 0) {
            result ^= 0x7fffffffffffffffL;
        }
        return result;
    }
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