spark TimeTravelSpec 源码
spark TimeTravelSpec 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TimeTravelSpec.scala
/*
* 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.spark.sql.catalyst.analysis
import org.apache.spark.sql.catalyst.expressions.{Cast, Expression, RuntimeReplaceable, SubqueryExpression, Unevaluable}
import org.apache.spark.sql.errors.QueryCompilationErrors
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types.TimestampType
sealed trait TimeTravelSpec
case class AsOfTimestamp(timestamp: Long) extends TimeTravelSpec
case class AsOfVersion(version: String) extends TimeTravelSpec
object TimeTravelSpec {
def create(
timestamp: Option[Expression],
version: Option[String],
conf: SQLConf) : Option[TimeTravelSpec] = {
if (timestamp.nonEmpty && version.nonEmpty) {
throw QueryCompilationErrors.invalidTimeTravelSpecError()
} else if (timestamp.nonEmpty) {
val ts = timestamp.get
assert(ts.resolved && ts.references.isEmpty && !SubqueryExpression.hasSubquery(ts))
if (!Cast.canAnsiCast(ts.dataType, TimestampType)) {
throw QueryCompilationErrors.invalidTimestampExprForTimeTravel(ts)
}
val tsToEval = ts.transform {
case r: RuntimeReplaceable => r.replacement
case _: Unevaluable =>
throw QueryCompilationErrors.invalidTimestampExprForTimeTravel(ts)
case e if !e.deterministic =>
throw QueryCompilationErrors.invalidTimestampExprForTimeTravel(ts)
}
val tz = Some(conf.sessionLocalTimeZone)
// Set `ansiEnabled` to false, so that it can return null for invalid input and we can provide
// better error message.
val value = Cast(tsToEval, TimestampType, tz, ansiEnabled = false).eval()
if (value == null) {
throw QueryCompilationErrors.invalidTimestampExprForTimeTravel(ts)
}
Some(AsOfTimestamp(value.asInstanceOf[Long]))
} else if (version.nonEmpty) {
Some(AsOfVersion(version.get))
} else {
None
}
}
}
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