gortiz commented on code in PR #19905:
URL: https://github.com/apache/pinot/pull/19905#discussion_r4296188582
##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/AnyValueAggregationFunction.java:
##########
@@ -197,10 +198,12 @@ private void aggregateHelper(int length, BlockValSet bvs,
ValueProcessor<Object>
}
});
} else {
- // Fall back to direct value access based on type
+ // Fall back to direct value access based on type. Read the values once
per block: for a transform input, each
+ // get*ValuesSV() call evaluates the transform on the whole block again.
+ IntFunction<Object> valueReader = getDirectValueReader(bvs);
Review Comment:
Right, an all-null or empty block now evaluates the transform once instead
of zero times. I kept it simple on purpose: one evaluation per block is the
normal cost for any aggregation over a transform, and making the reader lazy
adds a branch on the hot path for an edge case.
##########
pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/AnyValueAggregationFunction.java:
##########
@@ -231,23 +234,38 @@ private Object getDictionaryValue(Dictionary dict, int
dictId, DataType storedTy
}
}
- /// Get value directly from BlockValSet based on data type
- private Object getDirectValue(BlockValSet bvs, int index) {
+ /// Returns a reader for the values of the BlockValSet based on data type.
The values are read once, when this method
+ /// is called.
+ private IntFunction<Object> getDirectValueReader(BlockValSet bvs) {
Review Comment:
Added a BYTES case. It checks that `getBytesValuesSV()` is called once per
block and that each group gets `new ByteArray(values[i])`.
##########
pinot-core/src/test/java/org/apache/pinot/core/query/aggregation/function/AnyValueGroupByRecomputationTest.java:
##########
@@ -0,0 +1,70 @@
+/**
+ * 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.pinot.core.query.aggregation.function;
+
+import java.util.List;
+import java.util.Map;
+import org.apache.pinot.common.request.context.ExpressionContext;
+import org.apache.pinot.core.common.BlockValSet;
+import org.apache.pinot.core.query.aggregation.groupby.GroupByResultHolder;
+import org.apache.pinot.spi.data.FieldSpec.DataType;
+import org.testng.annotations.Test;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockingDetails;
+import static org.mockito.Mockito.when;
+import static org.testng.Assert.assertEquals;
+
+
+/// Counts how many times ANY_VALUE group-by reads the values of a
non-dictionary input per block.
+///
+/// A transform input (for example `jsonExtractScalar`) recomputes the whole
block on every `get*ValuesSV()` call,
+/// so the number of calls per block multiplies the transform cost.
+public class AnyValueGroupByRecomputationTest {
+ private static final int NUM_DOCS = 1000;
+
+ @Test
+ public void testGroupByReadsNonDictionaryValuesOncePerBlock() {
+ ExpressionContext expression =
ExpressionContext.forIdentifier("jsonExtractResult");
+ AnyValueAggregationFunction function = new
AnyValueAggregationFunction(List.of(expression), false);
+
+ String[] values = new String[NUM_DOCS];
+ int[] groupKeys = new int[NUM_DOCS];
+ for (int i = 0; i < NUM_DOCS; i++) {
+ values[i] = "zone-" + (i % 3);
+ groupKeys[i] = i;
+ }
+ BlockValSet valueSet = mock(BlockValSet.class);
+ when(valueSet.getValueType()).thenReturn(DataType.STRING);
+ when(valueSet.isDictionaryEncoded()).thenReturn(false);
+ when(valueSet.isSingleValue()).thenReturn(true);
Review Comment:
Removed, thanks.
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