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From GitBox <...@apache.org>
Subject [GitHub] [flink] sujun1020 commented on a change in pull request #13306: [FLINK-17779][Connectors/ORC]Orc file format support filter push down
Date Tue, 08 Sep 2020 04:05:27 GMT

sujun1020 commented on a change in pull request #13306:
URL: https://github.com/apache/flink/pull/13306#discussion_r484638264



##########
File path: flink-formats/flink-orc/src/main/java/org/apache/flink/orc/OrcFilters.java
##########
@@ -0,0 +1,273 @@
+/*
+ * 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.flink.orc;
+
+import org.apache.flink.table.expressions.CallExpression;
+import org.apache.flink.table.expressions.Expression;
+import org.apache.flink.table.expressions.FieldReferenceExpression;
+import org.apache.flink.table.expressions.ValueLiteralExpression;
+import org.apache.flink.table.functions.BuiltInFunctionDefinitions;
+import org.apache.flink.table.functions.FunctionDefinition;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.util.function.TriFunction;
+
+import org.apache.flink.shaded.curator4.com.google.common.collect.ImmutableMap;
+
+import org.apache.hadoop.hive.ql.io.sarg.PredicateLeaf;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Serializable;
+import java.util.Optional;
+import java.util.function.Function;
+
+/**
+ * Utility class that provides helper methods to work with Orc Filter PushDown.
+ */
+public class OrcFilters {
+
+	private static final Logger LOG = LoggerFactory.getLogger(OrcFileSystemFormatFactory.class);
+
+	private static final ImmutableMap<FunctionDefinition, Function<CallExpression, OrcSplitReader.Predicate>>
FILTERS =
+			new ImmutableMap.Builder<FunctionDefinition, Function<CallExpression, OrcSplitReader.Predicate>>()
+					.put(BuiltInFunctionDefinitions.IS_NULL, OrcFilters::convertIsNull)
+					.put(BuiltInFunctionDefinitions.IS_NOT_NULL, OrcFilters::convertIsNotNull)
+					.put(BuiltInFunctionDefinitions.NOT, OrcFilters::convertNot)
+					.put(BuiltInFunctionDefinitions.OR, OrcFilters::convertOr)
+					.put(BuiltInFunctionDefinitions.EQUALS, call -> convertBinary(call, OrcFilters::convertEquals,
OrcFilters::convertEquals))
+					.put(BuiltInFunctionDefinitions.NOT_EQUALS, call -> convertBinary(call, OrcFilters::convertNotEquals,
OrcFilters::convertNotEquals))
+					.put(BuiltInFunctionDefinitions.GREATER_THAN, call -> convertBinary(call, OrcFilters::convertGreaterThan,
OrcFilters::convertLessThanEquals))
+					.put(BuiltInFunctionDefinitions.GREATER_THAN_OR_EQUAL, call -> convertBinary(call,
OrcFilters::convertGreaterThanEquals, OrcFilters::convertLessThan))
+					.put(BuiltInFunctionDefinitions.LESS_THAN, call -> convertBinary(call, OrcFilters::convertLessThan,
OrcFilters::convertGreaterThanEquals))
+					.put(BuiltInFunctionDefinitions.LESS_THAN_OR_EQUAL, call -> convertBinary(call, OrcFilters::convertLessThanEquals,
OrcFilters::convertGreaterThan))
+					.build();
+
+	private static boolean isRef(Expression expression) {
+		return expression instanceof FieldReferenceExpression;
+	}
+
+	private static boolean isLit(Expression expression) {
+		return expression instanceof ValueLiteralExpression;
+	}
+
+	private static boolean isUnaryValid(CallExpression callExpression) {
+		return callExpression.getChildren().size() == 1 && isRef(callExpression.getChildren().get(0));
+	}
+
+	private static boolean isBinaryValid(CallExpression callExpression) {
+		return callExpression.getChildren().size() == 2 && (
+				isRef(callExpression.getChildren().get(0)) && isLit(callExpression.getChildren().get(1))
||
+						isLit(callExpression.getChildren().get(0)) && isRef(callExpression.getChildren().get(1))
+		);
+	}
+
+	private static OrcSplitReader.Predicate convertIsNull(CallExpression callExp) {
+		if (!isUnaryValid(callExp)) {
+			// not a valid predicate
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
callExp);
+			return null;
+		}
+
+		PredicateLeaf.Type colType = toOrcType(((FieldReferenceExpression) callExp.getChildren().get(0)).getOutputDataType());
+		if (colType == null) {
+			// unsupported type
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
callExp);
+			return null;
+		}
+
+		String colName = getColumnName(callExp);
+
+		return new OrcSplitReader.IsNull(colName, colType);
+	}
+
+	private static OrcSplitReader.Predicate convertIsNotNull(CallExpression callExp) {
+		return new OrcSplitReader.Not(convertIsNull(callExp));
+	}
+
+	private static OrcSplitReader.Predicate convertNot(CallExpression callExp) {
+		if (callExp.getChildren().size() != 1) {
+			// not a valid predicate
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
callExp);
+			return null;
+		}
+
+		OrcSplitReader.Predicate c = toOrcPredicate(callExp.getChildren().get(0));
+		return c == null ? null : new OrcSplitReader.Not(c);
+	}
+
+	private static OrcSplitReader.Predicate convertOr(CallExpression callExp) {
+		if (callExp.getChildren().size() < 2) {
+			return null;
+		}
+		Expression left = callExp.getChildren().get(0);
+		Expression right = callExp.getChildren().get(1);
+
+		OrcSplitReader.Predicate c1 = toOrcPredicate(left);
+		OrcSplitReader.Predicate c2 = toOrcPredicate(right);
+		if (c1 == null || c2 == null) {
+			return null;
+		} else {
+			return new OrcSplitReader.Or(c1, c2);
+		}
+	}
+
+	public static OrcSplitReader.Predicate convertBinary(CallExpression callExp,
+			TriFunction<String, PredicateLeaf.Type, Serializable, OrcSplitReader.Predicate>
func,
+			TriFunction<String, PredicateLeaf.Type, Serializable, OrcSplitReader.Predicate>
reverseFunc) {
+		if (!isBinaryValid(callExp)) {
+			// not a valid predicate
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
callExp);
+			return null;
+		}
+
+		PredicateLeaf.Type litType = getLiteralType(callExp);
+		if (litType == null) {
+			// unsupported literal type
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
callExp);
+			return null;
+		}
+
+		String colName = getColumnName(callExp);
+
+		// fetch literal and ensure it is serializable
+		Object literalObj = getLiteral(callExp).get();
+		Serializable literal;
+		// validate that literal is serializable
+		if (literalObj instanceof Serializable) {
+			literal = (Serializable) literalObj;
+		} else {
+			LOG.warn("Encountered a non-serializable literal of type {}. " +
+							"Cannot push predicate [{}] into OrcFileSystemFormatFactory. " +
+							"This is a bug and should be reported.",
+					literalObj.getClass().getCanonicalName(), callExp);
+			return null;
+		}
+
+		return literalOnRight(callExp) ? func.apply(colName, litType, literal) : reverseFunc.apply(colName,
litType, literal);
+	}
+
+	private static OrcSplitReader.Predicate convertEquals(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.Equals(colName, litType, literal);
+	}
+
+	private static OrcSplitReader.Predicate convertNotEquals(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.Not(convertEquals(colName, litType, literal));
+	}
+
+	private static OrcSplitReader.Predicate convertGreaterThan(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.Not(
+				new OrcSplitReader.LessThanEquals(colName, litType, literal));
+	}
+
+	private static OrcSplitReader.Predicate convertGreaterThanEquals(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.Not(
+				new OrcSplitReader.LessThan(colName, litType, literal));
+	}
+
+	private static OrcSplitReader.Predicate convertLessThan(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.LessThan(colName, litType, literal);
+	}
+
+	private static OrcSplitReader.Predicate convertLessThanEquals(String colName, PredicateLeaf.Type
litType, Serializable literal) {
+		return new OrcSplitReader.LessThanEquals(colName, litType, literal);
+	}
+
+	public static OrcSplitReader.Predicate toOrcPredicate(Expression expression) {
+		if (expression instanceof CallExpression) {
+			CallExpression callExp = (CallExpression) expression;
+			if (FILTERS.get(callExp.getFunctionDefinition()) == null) {
+				// unsupported predicate
+				LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
expression);
+				return null;
+			}
+			return FILTERS.get(callExp.getFunctionDefinition()).apply(callExp);
+		} else {
+			// unsupported predicate
+			LOG.debug("Unsupported predicate [{}] cannot be pushed into OrcFileSystemFormatFactory.",
expression);
+			return null;
+		}
+	}
+
+	private static String getColumnName(CallExpression comp) {
+		if (literalOnRight(comp)) {
+			return ((FieldReferenceExpression) comp.getChildren().get(0)).getName();
+		} else {
+			return ((FieldReferenceExpression) comp.getChildren().get(1)).getName();
+		}
+	}
+
+	private static boolean literalOnRight(CallExpression comp) {
+		if (comp.getChildren().size() == 1 && comp.getChildren().get(0) instanceof FieldReferenceExpression)
{
+			return true;
+		} else if (isLit(comp.getChildren().get(0)) && isRef(comp.getChildren().get(1)))
{
+			return false;
+		} else if (isRef(comp.getChildren().get(0)) && isLit(comp.getChildren().get(1)))
{
+			return true;
+		} else {
+			throw new RuntimeException("Invalid binary comparison.");
+		}
+	}
+
+	private static PredicateLeaf.Type getLiteralType(CallExpression comp) {
+		if (literalOnRight(comp)) {
+			return toOrcType(((ValueLiteralExpression) comp.getChildren().get(1)).getOutputDataType());
+		} else {
+			return toOrcType(((ValueLiteralExpression) comp.getChildren().get(0)).getOutputDataType());
+		}
+	}
+
+	private static Optional<?> getLiteral(CallExpression comp) {

Review comment:
       Flink LocalDate -> ORC java.sql.Date




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