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Subject [GitHub] [flink] dawidwys commented on a change in pull request #8360: [FLINK-12393][table-common] Add the user-facing classes of the new type system
Date Thu, 09 May 2019 07:28:17 GMT
dawidwys commented on a change in pull request #8360: [FLINK-12393][table-common] Add the user-facing
classes of the new type system
URL: https://github.com/apache/flink/pull/8360#discussion_r282365283

 File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/api/DataTypes.java
 @@ -0,0 +1,703 @@
+ * 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.flink.table.api;
+import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.api.common.ExecutionConfig;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.table.types.DataType;
+import org.apache.flink.table.types.logical.AnyType;
+import org.apache.flink.table.types.logical.ArrayType;
+import org.apache.flink.table.types.logical.BigIntType;
+import org.apache.flink.table.types.logical.BinaryType;
+import org.apache.flink.table.types.logical.BooleanType;
+import org.apache.flink.table.types.logical.CharType;
+import org.apache.flink.table.types.logical.DateType;
+import org.apache.flink.table.types.logical.DayTimeIntervalType;
+import org.apache.flink.table.types.logical.DayTimeIntervalType.DayTimeResolution;
+import org.apache.flink.table.types.logical.DecimalType;
+import org.apache.flink.table.types.logical.DoubleType;
+import org.apache.flink.table.types.logical.FloatType;
+import org.apache.flink.table.types.logical.IntType;
+import org.apache.flink.table.types.logical.LocalZonedTimestampType;
+import org.apache.flink.table.types.logical.LogicalType;
+import org.apache.flink.table.types.logical.MapType;
+import org.apache.flink.table.types.logical.MultisetType;
+import org.apache.flink.table.types.logical.NullType;
+import org.apache.flink.table.types.logical.RowType;
+import org.apache.flink.table.types.logical.SmallIntType;
+import org.apache.flink.table.types.logical.TimeType;
+import org.apache.flink.table.types.logical.TimestampType;
+import org.apache.flink.table.types.logical.TinyIntType;
+import org.apache.flink.table.types.logical.TypeInformationAnyType;
+import org.apache.flink.table.types.logical.VarBinaryType;
+import org.apache.flink.table.types.logical.VarCharType;
+import org.apache.flink.table.types.logical.YearMonthIntervalType;
+import org.apache.flink.table.types.logical.YearMonthIntervalType.YearMonthResolution;
+import org.apache.flink.table.types.logical.ZonedTimestampType;
+import org.apache.flink.util.Preconditions;
+import javax.annotation.Nullable;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.BiFunction;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+ * A {@link DataType} can be used to declare input and/or output types of operations. This
+ * enumerates all supported data types of the Table & SQL API.
+ */
+public final class DataTypes {
+	// we use SQL-like naming for data types and avoid Java keyword clashes
+	// CHECKSTYLE.OFF: MethodName
+	/**
+	 * Data type of a fixed-length character string {@code CHAR(n)} where {@code n} is the number
+	 * of code points. {@code n} must have a value between 1 and 255 (both inclusive).
+	 *
+	 * @see CharType
+	 */
+	public static DataType.AtomicDataType CHAR(int n) {
 Review comment:
   Can we return just the `DataType` rather than more concrete subclasses? I think we should
try to expose as little internal structure as possible. This would give us more flexibility
over the API, and it would still be quite easy to expose more if needed in the future.

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