ajantha-bhat commented on a change in pull request #3887: URL: https://github.com/apache/carbondata/pull/3887#discussion_r476625494
########## File path: integration/presto/src/main/prestosql/org/apache/carbondata/presto/readers/ComplexTypeStreamReader.java ########## @@ -0,0 +1,199 @@ +/* + * 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.presto.readers; + +import java.util.ArrayList; +import java.util.List; +import java.util.Optional; + +import io.prestosql.spi.block.ArrayBlock; +import io.prestosql.spi.block.RowBlock; +import io.prestosql.spi.type.*; + +import org.apache.carbondata.core.metadata.datatype.DataType; +import org.apache.carbondata.core.metadata.datatype.DataTypes; +import org.apache.carbondata.core.metadata.datatype.StructField; +import org.apache.carbondata.core.scan.result.vector.CarbonColumnVector; +import org.apache.carbondata.core.scan.result.vector.impl.CarbonColumnVectorImpl; + +import io.prestosql.spi.block.Block; +import io.prestosql.spi.block.BlockBuilder; + +import org.apache.carbondata.presto.CarbonVectorBatch; +import org.apache.carbondata.presto.ColumnarVectorWrapperDirect; + +/** + * Class to read the complex type Stream [array/struct/map] + */ + +public class ComplexTypeStreamReader extends CarbonColumnVectorImpl + implements PrestoVectorBlockBuilder { + + protected int batchSize; + + protected Type type; + protected BlockBuilder builder; + + public ComplexTypeStreamReader(int batchSize, StructField field) { + super(batchSize, field.getDataType()); + this.batchSize = batchSize; + this.type = getType(field); + ArrayList<CarbonColumnVector> childrenList = new ArrayList<>(); + for (StructField child : field.getChildren()) { + childrenList.add(new ColumnarVectorWrapperDirect( + CarbonVectorBatch.createDirectStreamReader(this.batchSize, child.getDataType(), child))); + } + setChildrenVector(childrenList); + this.builder = type.createBlockBuilder(null, batchSize); + } + + Type getType(StructField field) { + DataType dataType = field.getDataType(); + if (dataType == DataTypes.STRING || dataType == DataTypes.VARCHAR) { + return VarcharType.VARCHAR; + } else if (dataType == DataTypes.SHORT) { + return SmallintType.SMALLINT; + } else if (dataType == DataTypes.INT) { + return IntegerType.INTEGER; + } else if (dataType == DataTypes.LONG) { + return BigintType.BIGINT; + } else if (dataType == DataTypes.DOUBLE) { + return DoubleType.DOUBLE; + } else if (dataType == DataTypes.FLOAT) { + return RealType.REAL; + } else if (dataType == DataTypes.BOOLEAN) { + return BooleanType.BOOLEAN; + } else if (dataType == DataTypes.BINARY) { + return VarbinaryType.VARBINARY; + } else if (dataType == DataTypes.DATE) { + return DateType.DATE; + } else if (dataType == DataTypes.TIMESTAMP) { + return TimestampType.TIMESTAMP; + } else if (dataType == DataTypes.BYTE) { + return TinyintType.TINYINT; + } else if (DataTypes.isDecimal(dataType)) { + org.apache.carbondata.core.metadata.datatype.DecimalType decimal = + (org.apache.carbondata.core.metadata.datatype.DecimalType) dataType; + return DecimalType.createDecimalType(decimal.getPrecision(), decimal.getScale()); + } else if (DataTypes.isArrayType(dataType)) { + return new ArrayType(getType(field.getChildren().get(0))); + } else if (DataTypes.isStructType(dataType)) { + List<RowType.Field> children = new ArrayList<>(); + for (StructField child : field.getChildren()) { + children.add(new RowType.Field(Optional.of(child.getFieldName()), getType(child))); + } + return RowType.from(children); + } else { + throw new UnsupportedOperationException("Unsupported type: " + dataType); + } + } + + @Override public Block buildBlock() { + return builder.build(); + } + + @Override public void setBatchSize(int batchSize) { + this.batchSize = batchSize; + } + + @Override public void putObject(int rowId, Object value) { + if (value == null) { + putNull(rowId); + } else { + getChildrenVector().get(0).putObject(rowId, value); + } + } + + public void putComplexObject(List<Integer> offsetVector) { + if (type instanceof ArrayType) { + Block childBlock = buildChildBlock(getChildrenVector().get(0)); + // prepare an offset vector with 0 as initial offset + int[] offsetVectorArray = new int[offsetVector.size() + 1]; + for (int i = 1; i <= offsetVector.size(); i++) { + offsetVectorArray[i] = offsetVectorArray[i -1] + offsetVector.get(i - 1); Review comment: wonder why checkstyle is not catching ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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