raminqaf commented on code in PR #28277:
URL: https://github.com/apache/flink/pull/28277#discussion_r3324210564
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/operations/SqlNodeConvertContext.java:
##########
@@ -110,6 +127,55 @@ public String toQuotedSqlString(SqlNode sqlNode) {
return sqlNode.toSqlString(getSqlDialect()).getSql();
}
+ @Override
+ public Optional<String> toRawSqlString(SqlNode node) {
Review Comment:
No, and that's expected. I ran your exact snippet:
```
outer statement "CREATE TABLE x AS SELECT a FROM t1"
innerAsQuery.getParserPosition() -> line 1, column 19
new SqlNodeConvertContext(planner, catalogManager,
outerStatement).toRawSqlString(innerAsQuery)
-> Optional[SELECT a FROM t1]
new SqlNodeConvertContext(planner, catalogManager, "SELECT a FROM
t1").toRawSqlString(innerAsQuery)
-> Optional.empty
```
the method has a precondition: the statement passed to the context must be
the same text the node was parsed from. When that holds, the slice is correct.
It fails safe. It never returns a wrong substring and never throws.
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