Github user chenliang613 commented on a diff in the pull request:
https://github.com/apache/carbondata/pull/1218#discussion_r130582527
--- Diff:
integration/presto/src/main/java/org/apache/carbondata/presto/CarbondataFilterUtil.java
---
@@ -0,0 +1,223 @@
+/*
+ * 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
+ */
+
+package org.apache.carbondata.presto;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.apache.carbondata.core.metadata.datatype.DataType;
+import org.apache.carbondata.core.metadata.schema.table.CarbonTable;
+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.conditional.EqualToExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.GreaterThanEqualToExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.GreaterThanExpression;
+import org.apache.carbondata.core.scan.expression.conditional.InExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.LessThanEqualToExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.LessThanExpression;
+import
org.apache.carbondata.core.scan.expression.conditional.ListExpression;
+import org.apache.carbondata.core.scan.expression.logical.AndExpression;
+import org.apache.carbondata.core.scan.expression.logical.OrExpression;
+
+import com.facebook.presto.spi.ColumnHandle;
+import com.facebook.presto.spi.predicate.Domain;
+import com.facebook.presto.spi.predicate.Range;
+import com.facebook.presto.spi.predicate.TupleDomain;
+import com.facebook.presto.spi.type.BigintType;
+import com.facebook.presto.spi.type.BooleanType;
+import com.facebook.presto.spi.type.DateType;
+import com.facebook.presto.spi.type.DecimalType;
+import com.facebook.presto.spi.type.DoubleType;
+import com.facebook.presto.spi.type.IntegerType;
+import com.facebook.presto.spi.type.SmallintType;
+import com.facebook.presto.spi.type.TimestampType;
+import com.facebook.presto.spi.type.Type;
+import com.facebook.presto.spi.type.VarcharType;
+import com.google.common.collect.ImmutableList;
+import io.airlift.slice.Slice;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+public class CarbondataFilterUtil {
+
+ private static Map<Integer, Expression> filterMap = new HashMap<>();
+
+ private static DataType Spi2CarbondataTypeMapper(CarbondataColumnHandle
carbondataColumnHandle) {
+ Type colType = carbondataColumnHandle.getColumnType();
+ if (colType == BooleanType.BOOLEAN) return DataType.BOOLEAN;
+ else if (colType == SmallintType.SMALLINT) return DataType.SHORT;
+ else if (colType == IntegerType.INTEGER) return DataType.INT;
+ else if (colType == BigintType.BIGINT) return DataType.LONG;
+ else if (colType == DoubleType.DOUBLE) return DataType.DOUBLE;
+ else if (colType == VarcharType.VARCHAR) return DataType.STRING;
+ else if (colType == DateType.DATE) return DataType.DATE;
+ else if (colType == TimestampType.TIMESTAMP) return DataType.TIMESTAMP;
+ else if (colType ==
DecimalType.createDecimalType(carbondataColumnHandle.getPrecision(),
+ carbondataColumnHandle.getScale())) return DataType.DECIMAL;
+ else return DataType.STRING;
+ }
+
+ /**
+ * Convert presto-TupleDomain predication into Carbon scan express
condition
+ *
+ * @param originalConstraint presto-TupleDomain
+ * @param carbonTable
+ * @return
+ */
+ public static Expression parseFilterExpression(TupleDomain<ColumnHandle>
originalConstraint,
+ CarbonTable carbonTable) {
+ ImmutableList.Builder<Expression> filters = ImmutableList.builder();
+
+ Domain domain = null;
+
+ for (ColumnHandle c : originalConstraint.getDomains().get().keySet()) {
+
+ // Build ColumnExpresstion for Expresstion(Carbondata)
+ CarbondataColumnHandle cdch = (CarbondataColumnHandle) c;
+ Type type = cdch.getColumnType();
+
+ DataType coltype = Spi2CarbondataTypeMapper(cdch);
+ Expression colExpression = new
ColumnExpression(cdch.getColumnName(), coltype);
+
+ domain = originalConstraint.getDomains().get().get(c);
+ checkArgument(domain.getType().isOrderable(), "Domain type must be
orderable");
+
+ if (domain.getValues().isNone()) {
--- End diff --
Whether can remove the code ,or not ?
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