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https://issues.apache.org/jira/browse/FLINK-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16573051#comment-16573051
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ASF GitHub Bot commented on FLINK-9713:
---------------------------------------
twalthr commented on a change in pull request #6299: [FLINK-9713][table][sql]
Support processing time versioned joins
URL: https://github.com/apache/flink/pull/6299#discussion_r208502190
##########
File path:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/table.scala
##########
@@ -155,6 +158,90 @@ class Table(
select(withResolvedAggFunctionCall: _*)
}
+ /**
+ * Creates table version function backed up by this table as a history
table.
+ *
+ * @param version field for the [[TableVersionFunction]]. Must points to a
time indicator
+ * @param primaryKey field for the [[TableVersionFunction]].
+ * @return [[TableVersionFunction]]
+ */
+ def createTableVersionFunction(
+ version: String,
+ primaryKey: String): TableVersionFunction = {
+ createTableVersionFunction(
+ ExpressionParser.parseExpression(version),
+ ExpressionParser.parseExpression(primaryKey))
+ }
+
+ /**
+ * Creates table version function backed up by this table as a history
table.
+ *
+ * @param version field for the [[TableVersionFunction]]. Must points to a
time indicator
+ * @param primaryKey field for the [[TableVersionFunction]].
+ * @return [[TableVersionFunction]]
+ */
+ def createTableVersionFunction(
+ version: Expression,
+ primaryKey: Expression): TableVersionFunction = {
+ val (versionField, isProctime) = validateVersionExpression(version)
+ TableVersionFunction.create(
+ this,
+ versionField,
+ validatePrimaryKeyExpression(primaryKey),
+ isProctime)
+ }
+
+ private def validateVersionExpression(expression: Expression): (String,
Boolean) = {
+ expression match {
+ case rowtime: RowtimeAttribute =>
Review comment:
The expressions `RowtimeAttribute` and `ProctimeAttribute` should only be
used when converting a DataStream to a table. The validation should happen at a
later stage when fields are resolved. Proper time attributes can only be check
during translation for now (I agree this is ugly.)
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> Support versioned joins in planning phase
> -----------------------------------------
>
> Key: FLINK-9713
> URL: https://issues.apache.org/jira/browse/FLINK-9713
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Affects Versions: 1.5.0
> Reporter: Piotr Nowojski
> Assignee: Piotr Nowojski
> Priority: Major
> Labels: pull-request-available
>
> Queries like:
> {code:java}
> SELECT
> o.amount * r.rate
> FROM
> Orders AS o,
> LATERAL TABLE (Rates(o.rowtime)) AS r
> WHERE o.currency = r.currency{code}
> should evaluate to valid plan with versioned joins plan node.
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