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This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.planner.functions.inference;
import org.apache.flink.annotation.Internal;
import org.apache.flink.table.catalog.DataTypeFactory;
import org.apache.flink.table.expressions.ValueLiteralExpression;
import org.apache.flink.table.functions.FunctionDefinition;
import org.apache.flink.table.types.inference.CallContext;
import org.apache.flink.util.Preconditions;
import org.apache.calcite.util.DateString;
import org.apache.calcite.util.TimeString;
import org.apache.calcite.util.TimestampString;
import java.time.Duration;
import java.time.Period;
import java.time.ZoneOffset;
/** A {@link CallContext} backed by Calcite abstractions. */
@Internal
public abstract class AbstractSqlCallContext implements CallContext {
private final DataTypeFactory dataTypeFactory;
private final FunctionDefinition definition;
private final String name;
private final boolean isGroupedAggregation;
protected AbstractSqlCallContext(
DataTypeFactory dataTypeFactory,
FunctionDefinition definition,
String name,
boolean isGroupedAggregation) {
this.dataTypeFactory = dataTypeFactory;
this.definition = definition;
this.name = name;
this.isGroupedAggregation = isGroupedAggregation;
}
@Override
public DataTypeFactory getDataTypeFactory() {
return dataTypeFactory;
}
@Override
public FunctionDefinition getFunctionDefinition() {
return definition;
}
@Override
public String getName() {
return name;
}
@Override
public boolean isGroupedAggregation() {
return isGroupedAggregation;
}
// --------------------------------------------------------------------------------------------
/** Helper interface for abstracting accessing literals. */
protected interface LiteralValueAccessor {
T getValueAs(Class clazz);
}
/** Bridges to {@link ValueLiteralExpression#getValueAs(Class)}. */
@SuppressWarnings("unchecked")
protected static T getLiteralValueAs(LiteralValueAccessor accessor, Class clazz) {
Preconditions.checkArgument(!clazz.isPrimitive());
Object convertedValue = null;
if (clazz == Duration.class) {
final long longVal = accessor.getValueAs(Long.class);
convertedValue = Duration.ofMillis(longVal);
} else if (clazz == Period.class) {
final long longVal = accessor.getValueAs(Long.class);
if (longVal <= Integer.MAX_VALUE && longVal >= Integer.MIN_VALUE) {
convertedValue = Period.ofMonths((int) longVal);
}
} else if (clazz == java.time.LocalDate.class) {
final DateString dateString = accessor.getValueAs(DateString.class);
convertedValue = java.time.LocalDate.parse(dateString.toString());
} else if (clazz == java.time.LocalTime.class) {
final TimeString timeString = accessor.getValueAs(TimeString.class);
convertedValue = java.time.LocalTime.parse(timeString.toString());
} else if (clazz == java.time.LocalDateTime.class) {
final TimestampString timestampString = accessor.getValueAs(TimestampString.class);
convertedValue =
java.time.LocalDateTime.parse(timestampString.toString().replace(' ', 'T'));
} else if (clazz == java.time.Instant.class) {
// timestamp string is in UTC, convert back to an instant
final TimestampString timestampString = accessor.getValueAs(TimestampString.class);
convertedValue =
java.time.LocalDateTime.parse(timestampString.toString().replace(' ', 'T'))
.atOffset(ZoneOffset.UTC)
.toInstant();
}
if (convertedValue != null) {
return (T) convertedValue;
}
return accessor.getValueAs(clazz);
}
}