[GitHub] [carbondata] ajantha-bhat commented on a change in pull request #3317: [CARBONDATA-3461] Carbon SDK support filter equal values set.

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ajantha-bhat commented on a change in pull request #3317: [CARBONDATA-3461] Carbon SDK support filter equal values set.
URL: https://github.com/apache/carbondata/pull/3317#discussion_r300925997
 
 

 ##########
 File path: core/src/main/java/org/apache/carbondata/core/scan/expression/conditional/FilterUtil.java
 ##########
 @@ -0,0 +1,122 @@
+/*
+ * 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.carbondata.core.scan.expression.conditional;
+
+import java.util.List;
+
+import org.apache.carbondata.core.metadata.datatype.*;
+import org.apache.carbondata.core.scan.expression.ColumnExpression;
+import org.apache.carbondata.core.scan.expression.Expression;
+import org.apache.carbondata.core.scan.expression.LiteralExpression;
+import org.apache.carbondata.core.scan.expression.logical.OrExpression;
+
+
+/**
+ * provide function to prepare expression for filter
+ */
+public class FilterUtil {
+  public static Expression prepareEqualToExpression(String columnName, String dataType,
+      Object value) {
+    if (DataTypes.STRING.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.STRING),
+          new LiteralExpression(value, DataTypes.STRING));
+    } else if (DataTypes.INT.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.INT),
+          new LiteralExpression(value, DataTypes.INT));
+    } else if (DataTypes.DOUBLE.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.DOUBLE),
+          new LiteralExpression(value, DataTypes.DOUBLE));
+    } else if (DataTypes.FLOAT.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.FLOAT),
+          new LiteralExpression(value, DataTypes.FLOAT));
+    } else if (DataTypes.SHORT.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.SHORT),
+          new LiteralExpression(value, DataTypes.SHORT));
+    } else if (DataTypes.BINARY.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.BINARY),
+          new LiteralExpression(value, DataTypes.BINARY));
+    } else if (DataTypes.DATE.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.DATE),
+          new LiteralExpression(value, DataTypes.DATE));
+    } else if (DataTypes.LONG.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.LONG),
+          new LiteralExpression(value, DataTypes.LONG));
+    } else if (DataTypes.TIMESTAMP.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.TIMESTAMP),
+          new LiteralExpression(value, DataTypes.TIMESTAMP));
+    } else if (DataTypes.BYTE.getName().equalsIgnoreCase(dataType)) {
+      return new EqualToExpression(
+          new ColumnExpression(columnName, DataTypes.BYTE),
+          new LiteralExpression(value, DataTypes.BYTE));
+    } else {
+      throw new IllegalArgumentException("Unsupported data type: " + dataType);
+    }
+  }
+
+  public static Expression prepareEqualToExpressionSet(String columnName, DataType dataType,
+      List<Object> values) {
 
 Review comment:
   If you introduce OrExpression, then no need of prepareEqualToExpressionSet.
   you can form list of equal to expressions and pass it to OrExpression.
   please remove prepareEqualToExpressionSet   --> because it is still takes single data type.

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