chunweilei commented on a change in pull request #2366:
URL: https://github.com/apache/calcite/pull/2366#discussion_r592008165
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File path: core/src/main/java/org/apache/calcite/sql/SqlSnapshot.java
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@@ -127,10 +129,25 @@ private SqlSnapshotOperator() {
int leftPrec,
int rightPrec) {
final SqlSnapshot snapshot = (SqlSnapshot) call;
-
- snapshot.tableRef.unparse(writer, 0, 0);
- writer.keyword("FOR SYSTEM_TIME AS OF");
- snapshot.period.unparse(writer, 0, 0);
+ SqlNode tableRef = snapshot.tableRef;
+
+ if (tableRef instanceof SqlBasicCall
+ && ((SqlBasicCall) tableRef).getOperator() instanceof SqlAsOperator)
{
+ SqlBasicCall basicCall = (SqlBasicCall) tableRef;
+ basicCall.operand(0).unparse(writer, 0, 0);
+ writer.setNeedWhitespace(true);
+ writeForSystemTimeAsOf(writer, snapshot);
+ writer.keyword("AS");
+ basicCall.operand(1).unparse(writer, 0, 0);
+ } else {
+ tableRef.unparse(writer, 0, 0);
+ writeForSystemTimeAsOf(writer, snapshot);
+ }
}
}
+
+ private static void writeForSystemTimeAsOf(SqlWriter writer, SqlSnapshot
snapshot) {
+ writer.keyword("FOR SYSTEM_TIME AS OF");
+ snapshot.period.unparse(writer, 0, 0);
Review comment:
Maybae it is better to put `writeForSystemTimeAsOf` in
SqlSnapshotOperator.
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