[GitHub] [flink] qingwei91 commented on a diff in pull request #20140: [Flink 16024][Connector][JDBC] Support FilterPushdown

[GitBox <gi...@apache.org>]

qingwei91 commented on code in PR #20140:
URL: https://github.com/apache/flink/pull/20140#discussion_r1002677936


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flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/JdbcFilterPushdownPreparedStatementVisitor.java:
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@@ -0,0 +1,178 @@
+/*
+ * 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.connector.jdbc.table;
+
+import org.apache.flink.annotation.Experimental;
+import org.apache.flink.table.expressions.CallExpression;
+import org.apache.flink.table.expressions.Expression;
+import org.apache.flink.table.expressions.ExpressionDefaultVisitor;
+import org.apache.flink.table.expressions.FieldReferenceExpression;
+import org.apache.flink.table.expressions.ResolvedExpression;
+import org.apache.flink.table.expressions.ValueLiteralExpression;
+import org.apache.flink.table.functions.BuiltInFunctionDefinitions;
+import org.apache.flink.table.types.logical.BigIntType;
+import org.apache.flink.table.types.logical.BooleanType;
+import org.apache.flink.table.types.logical.DateType;
+import org.apache.flink.table.types.logical.DecimalType;
+import org.apache.flink.table.types.logical.DoubleType;
+import org.apache.flink.table.types.logical.FloatType;
+import org.apache.flink.table.types.logical.IntType;
+import org.apache.flink.table.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.SmallIntType;
+import org.apache.flink.table.types.logical.TimestampType;
+import org.apache.flink.table.types.logical.VarCharType;
+
+import java.io.Serializable;
+import java.math.BigDecimal;
+import java.sql.Date;
+import java.sql.Timestamp;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+/**
+ * Visitor that convert Expression to ParameterizedPredicate. Return Optional.empty() if we cannot
+ * push down the filter.
+ */
+@Experimental
+public class JdbcFilterPushdownPreparedStatementVisitor
+        extends ExpressionDefaultVisitor<Optional<ParameterizedPredicate>> {
+
+    Function<String, String> quoteIdentifierFunction;
+
+    public static Set<Class<?>> supportedDataTypes;
+
+    static {
+        supportedDataTypes = new HashSet<>();
+        supportedDataTypes.add(IntType.class);
+        supportedDataTypes.add(BigIntType.class);
+        supportedDataTypes.add(BooleanType.class);
+        supportedDataTypes.add(DecimalType.class);
+        supportedDataTypes.add(DoubleType.class);
+        supportedDataTypes.add(FloatType.class);
+        supportedDataTypes.add(SmallIntType.class);
+        supportedDataTypes.add(VarCharType.class);
+        supportedDataTypes.add(TimestampType.class);
+    }
+
+    public JdbcFilterPushdownPreparedStatementVisitor(
+            Function<String, String> quoteIdentifierFunction) {
+        this.quoteIdentifierFunction = quoteIdentifierFunction;
+    }
+
+    @Override
+    public Optional<ParameterizedPredicate> visit(CallExpression call) {
+        if (BuiltInFunctionDefinitions.EQUALS.equals(call.getFunctionDefinition())) {
+            return renderBinaryOperator("=", call.getResolvedChildren());

Review Comment:
   Will do 👍 



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