Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/637#discussion_r86455969
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetRGFilterEvaluator.java
---
@@ -0,0 +1,252 @@
+/**
+ * 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
+ * <p/>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p/>
+ * 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.store.parquet;
+
+import com.google.common.collect.Sets;
+import org.apache.drill.common.expression.ErrorCollector;
+import org.apache.drill.common.expression.ErrorCollectorImpl;
+import org.apache.drill.common.expression.LogicalExpression;
+import org.apache.drill.common.expression.SchemaPath;
+import org.apache.drill.common.expression.visitors.AbstractExprVisitor;
+import org.apache.drill.exec.compile.sig.ConstantExpressionIdentifier;
+import org.apache.drill.exec.expr.ExpressionTreeMaterializer;
+import org.apache.drill.exec.expr.fn.FunctionImplementationRegistry;
+import org.apache.drill.exec.expr.stat.ParquetFilterPredicate;
+import org.apache.drill.exec.expr.stat.RangeExprEvaluator;
+import org.apache.drill.exec.ops.FragmentContext;
+import org.apache.drill.exec.ops.UdfUtilities;
+import org.apache.drill.exec.server.options.OptionManager;
+import org.apache.drill.exec.store.parquet.stat.ColumnStatCollector;
+import org.apache.drill.exec.store.parquet.stat.ColumnStatistics;
+import org.apache.drill.exec.store.parquet.stat.ParquetFooterStatCollector;
+import org.apache.parquet.filter2.predicate.FilterPredicate;
+import org.apache.parquet.filter2.statisticslevel.StatisticsFilter;
+import org.apache.parquet.hadoop.metadata.ColumnChunkMetaData;
+import org.apache.parquet.hadoop.metadata.ParquetMetadata;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class ParquetRGFilterEvaluator {
+ static final org.slf4j.Logger logger =
org.slf4j.LoggerFactory.getLogger(ParquetRGFilterEvaluator.class);
+
+ public static boolean evalFilter(LogicalExpression expr, ParquetMetadata
footer, int rowGroupIndex,
+ OptionManager options, FragmentContext fragmentContext) {
+ final HashMap<String, String> emptyMap = new HashMap<String, String>();
+ return evalFilter(expr, footer, rowGroupIndex, options,
fragmentContext, emptyMap);
+ }
+
+ public static boolean evalFilter(LogicalExpression expr, ParquetMetadata
footer, int rowGroupIndex,
+ OptionManager options, FragmentContext fragmentContext, Map<String,
String> implicitColValues) {
+ // figure out the set of columns referenced in expression.
+ final Set<SchemaPath> schemaPathsInExpr = expr.accept(new
FieldReferenceFinder(), null);
+ final ColumnStatCollector columnStatCollector = new
ParquetFooterStatCollector(footer, rowGroupIndex, implicitColValues,true,
options);
+
+ Map<SchemaPath, ColumnStatistics> columnStatisticsMap =
columnStatCollector.collectColStat(schemaPathsInExpr);
+
+ boolean canDrop = canDrop(expr, columnStatisticsMap,
footer.getBlocks().get(rowGroupIndex).getRowCount(), fragmentContext,
fragmentContext.getFunctionRegistry());
+ return canDrop;
+ }
+
+
+ public static boolean canDrop(ParquetFilterPredicate parquetPredicate,
Map<SchemaPath,
+ ColumnStatistics> columnStatisticsMap, long rowCount) {
+ boolean canDrop = false;
+ if (parquetPredicate != null) {
+ RangeExprEvaluator rangeExprEvaluator = new
RangeExprEvaluator(columnStatisticsMap, rowCount);
+ canDrop = parquetPredicate.canDrop(rangeExprEvaluator);
+ }
+ return canDrop;
+ }
+
+
+ public static boolean canDrop(LogicalExpression expr, Map<SchemaPath,
ColumnStatistics> columnStatisticsMap,
+ long rowCount, UdfUtilities udfUtilities,
FunctionImplementationRegistry functionImplementationRegistry) {
+ ErrorCollector errorCollector = new ErrorCollectorImpl();
+ LogicalExpression materializedFilter =
ExpressionTreeMaterializer.materializeFilterExpr(
+ expr, columnStatisticsMap, errorCollector,
functionImplementationRegistry);
+
+ if (errorCollector.hasErrors()) {
+ logger.error("{} error(s) encountered when materialize filter
expression : {}",
+ errorCollector.getErrorCount(), errorCollector.toErrorString());
+ return false;
+ }
+
+ Set<LogicalExpression> constantBoundaries =
ConstantExpressionIdentifier.getConstantExpressionSet(materializedFilter);
+ ParquetFilterPredicate parquetPredicate = (ParquetFilterPredicate)
ParquetFilterBuilder.buildParquetFilterPredicate(
+ materializedFilter, constantBoundaries, udfUtilities);
+
+ return canDrop(parquetPredicate, columnStatisticsMap, rowCount);
+ }
+
+// public static boolean evalFilter2(LogicalExpression expr,
ParquetMetadata footer, int rowGroupIndex, OptionManager options,
FragmentContext fragmentContext, Map<String, String> implicitColValues) {
--- End diff --
My negligence. I should have clean up the commented code.
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