[FLINK-12253][table-common] Setup a class hierarchy for the new logical type system

flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/logical/LogicalTypeVisitor.java

@@ -55,5 +55,7 @@ public interface LogicalTypeVisitor<R> {
 
 	R visit(DateType dateType);
 
+	R visit(TimeType timeType);
+
 	R visit(LogicalType other);
 }

flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/logical/TimeType.java

@@ -0,0 +1,144 @@
+/*
+ * 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.types.logical;
+
+import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.table.api.ValidationException;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * Logical type of a time WITHOUT timezone consisting of {@code hour:minute:second[.fractional]} with up
+ * to nanosecond precision and values ranging from {@code 00:00:00.000000000} to
+ * {@code 23:59:59.999999999}. Compared to the SQL standard, leap seconds (23:59:60 and 23:59:61) are
+ * not supported as the semantics are closer to {@link java.time.LocalTime}.
+ *
+ * <p>The serialized string representation is {@code TIME(p)} where {@code p} is the number of digits
+ * of fractional seconds (=precision). {@code p} must have a value between 0 and 9 (both inclusive).
+ * If no precision is specified, {@code p} is equal to 0.
+ *
+ * <p>A conversion from and to {@code int} describes the number of milliseconds of the day. A
+ * conversion from and to {@code long} describes the number of nanoseconds of the day.
+ */
+@PublicEvolving
+public final class TimeType extends LogicalType {
+
+	private static final int MIN_PRECISION = 0;
+
+	private static final int MAX_PRECISION = 9;
+
+	private static final int DEFAULT_PRECISION = 0;
+
+	private static final String DEFAULT_FORMAT = "TIME(%d)";
+
+	private static final Set<String> NULL_OUTPUT_CONVERSION = conversionSet(
+		java.sql.Time.class.getName(),
+		java.time.LocalTime.class.getName());
+
+	private static final Set<String> NOT_NULL_INPUT_OUTPUT_CONVERSION = conversionSet(
+		java.sql.Time.class.getName(),
+		java.time.LocalTime.class.getName(),
+		int.class.getName(),
+		long.class.getName());
+
+	private static final Class<?> DEFAULT_CONVERSION = java.time.LocalTime.class;
+
+	private final int precision;
+
+	public TimeType(boolean isNullable, int precision) {
+		super(isNullable, LogicalTypeRoot.TIME_WITHOUT_TIME_ZONE);
+		if (precision < MIN_PRECISION || precision > MAX_PRECISION) {
+			throw new ValidationException(
+				String.format(
+					"Time precision must be between %d and %d (both inclusive).",
+					MIN_PRECISION,
+					MAX_PRECISION));
+		}
+		this.precision = precision;
+	}
+
+	public TimeType(int precision) {
+		this(true, precision);
+	}
+
+	public TimeType() {
+		this(DEFAULT_PRECISION);
+	}
+
+	@Override
+	public LogicalType copy(boolean isNullable) {
+		return new TimeType(isNullable, precision);
+	}
+
+	@Override
+	public String asSerializableString() {
+		return withNullability(DEFAULT_FORMAT, precision);
+	}
+
+	@Override
+	public boolean supportsInputConversion(Class<?> clazz) {
+		return NOT_NULL_INPUT_OUTPUT_CONVERSION.contains(clazz.getName());
+	}
+
+	@Override
+	public boolean supportsOutputConversion(Class<?> clazz) {
+		if (isNullable()) {
+			return NULL_OUTPUT_CONVERSION.contains(clazz.getName());
+		}
+		return NOT_NULL_INPUT_OUTPUT_CONVERSION.contains(clazz.getName());
+	}
+
+	@Override
+	public Class<?> getDefaultOutputConversion() {
+		return DEFAULT_CONVERSION;
+	}
+
+	@Override
+	public List<LogicalType> getChildren() {
+		return Collections.emptyList();
+	}
+
+	@Override
+	public <R> R accept(LogicalTypeVisitor<R> visitor) {
+		return visitor.visit(this);
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		if (!super.equals(o)) {
+			return false;
+		}
+		TimeType timeType = (TimeType) o;
+		return precision == timeType.precision;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(super.hashCode(), precision);
+	}
+}

flink-table/flink-table-common/src/test/java/org/apache/flink/table/types/LogicalTypesTest.java

@@ -29,6 +29,7 @@
 import org.apache.flink.table.types.logical.IntType;
 import org.apache.flink.table.types.logical.LogicalType;
 import org.apache.flink.table.types.logical.SmallIntType;
+import org.apache.flink.table.types.logical.TimeType;
 import org.apache.flink.table.types.logical.TinyIntType;
 import org.apache.flink.table.types.logical.VarBinaryType;
 import org.apache.flink.table.types.logical.VarCharType;
@@ -207,6 +208,18 @@ public void testDateType() {
 		);
 	}
 
+	@Test
+	public void testTimeType() {
+		testAll(
+			new TimeType(9),
+			"TIME(9)",
+			new Class[]{java.sql.Time.class, java.time.LocalTime.class, long.class},
+			new Class[]{java.time.LocalTime.class},
+			new LogicalType[]{},
+			new TimeType()
+		);
+	}
+
 	// --------------------------------------------------------------------------------------------
 
 	private static void testAll(