aiguofer commented on code in PR #38404: URL: https://github.com/apache/arrow/pull/38404#discussion_r1371163295
########## java/flight/flight-sql-jdbc-core/src/main/java/org/apache/arrow/driver/jdbc/utils/ArrowToJdbcUtils.java: ########## @@ -0,0 +1,123 @@ +/* + * 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.arrow.driver.jdbc.utils; + +import java.math.BigDecimal; +import java.sql.Date; +import java.sql.Time; +import java.sql.Timestamp; +import java.sql.Types; +import java.util.ArrayList; +import java.util.HashMap; + +import org.apache.arrow.vector.types.pojo.ArrowType; + +/** + * Helper class to convert Arrow types to JDBC required values. + */ +class ArrowToJdbcUtils { + static boolean isSigned(ArrowType.ArrowTypeID type) { + switch (type) { + case Int: + case FloatingPoint: + case Decimal: + case Interval: + case Duration: + return true; + default: + return false; + } + } + + static int toJdbcType(ArrowType type) { + switch (type.getTypeID()) { + case Null: + return Types.NULL; + case Struct: + return Types.STRUCT; + case List: + case LargeList: + case FixedSizeList: + return Types.ARRAY; + case Int: + return ((ArrowType.Int) type).getBitWidth() == 64 ? Types.BIGINT : Types.INTEGER; + case FloatingPoint: + return Types.FLOAT; + case Utf8: + case LargeUtf8: + return Types.VARCHAR; + case Binary: + case LargeBinary: + return Types.VARBINARY; + case FixedSizeBinary: + return Types.BINARY; + case Bool: + return Types.BOOLEAN; + case Decimal: + return Types.DECIMAL; + case Date: + return Types.DATE; + case Time: + return Types.TIME; + case Timestamp: + case Interval: + case Duration: + return Types.TIMESTAMP; + default: + return Types.OTHER; + } + + } + + static String getClassName(ArrowType type) { + switch (type.getTypeID()) { + case List: + case LargeList: + case FixedSizeList: + return ArrayList.class.getCanonicalName(); + case Map: + return HashMap.class.getCanonicalName(); + case Int: + return ((ArrowType.Int) type).getBitWidth() == 64 ? + long.class.getCanonicalName() : int.class.getCanonicalName(); + case FloatingPoint: + return float.class.getCanonicalName(); + case Utf8: + case LargeUtf8: + return String.class.getCanonicalName(); + case Binary: + case LargeBinary: + case FixedSizeBinary: + return byte[].class.getCanonicalName(); + case Bool: + return boolean.class.getCanonicalName(); + case Decimal: + return BigDecimal.class.getCanonicalName(); + case Date: + return Date.class.getCanonicalName(); + case Time: + return Time.class.getCanonicalName(); + case Timestamp: + case Interval: + case Duration: + return Timestamp.class.getCanonicalName(); + default: + return null; Review Comment: Additionally, FWIW, these are the only types not covered: ``` Null(Type.Null), Struct(Type.Struct_), Union(Type.Union), NONE(Type.NONE); ``` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
