[GitHub] [spark] huaxingao commented on a change in pull request #33803: [SPARK-36556][SQL] Add DSV2 filters

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

huaxingao commented on a change in pull request #33803:
URL: https://github.com/apache/spark/pull/33803#discussion_r700651818



##########
File path: sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/filter/EqualNullSafe.java
##########
@@ -0,0 +1,49 @@
+/*
+ * 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.spark.sql.connector.expressions.filter;
+
+import org.apache.spark.annotation.Evolving;
+import org.apache.spark.sql.connector.expressions.Expression;
+import org.apache.spark.sql.connector.expressions.Literal;
+
+/**
+ * Performs equality comparison, similar to [[EqualTo]]. However, this differs from [[EqualTo]]
+ * in that it returns `true` (rather than NULL) if both inputs are NULL, and `false`
+ * (rather than NULL) if one of the input is NULL and the other is not NULL.
+ *
+ * @since 3.3.0
+ */
+@Evolving
+public final class EqualNullSafe<T> extends Filter {
+  private final Expression column;
+  private final Literal<T> value;
+
+  public EqualNullSafe(Expression column, Literal<T> value) {
+    this.column = column;
+    this.value = value;
+  }
+
+  public Expression column() { return column; }

Review comment:
       changed to `expr`

##########
File path: sql/catalyst/src/main/java/org/apache/spark/sql/connector/expressions/filter/Filter.java
##########
@@ -0,0 +1,48 @@
+/*
+ * 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.spark.sql.connector.expressions.filter;
+
+import org.apache.spark.annotation.Evolving;
+import org.apache.spark.sql.connector.expressions.Expression;
+
+/**
+ * Filter base class
+ *
+ * @since 3.3.0
+ */
+@Evolving
+public abstract class Filter implements Expression {
+
+  protected static final Expression[] EMPTY_REFERENCE = new Expression[0];
+
+  /**
+   * Returns list of columns that are referenced by this filter.
+   */
+  public abstract Expression[] references();

Review comment:
       Changed to `NamedReference[]`




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