Thanks Jacques, It's so elaborate that I get it.
Jacques Nadeau 于2022年4月14日周四 03:01写道：
> You need to complete validation in order to confirm that all tables are
> real. For example, validation includes clarifying ambiguities (since users
> can rely on implicit resolution but rel trees cannot).
You need to complete validation in order to confirm that all tables are
real. For example, validation includes clarifying ambiguities (since users
can rely on implicit resolution but rel trees cannot).
For #2: this is a really hard thing to do with Calcite. We did this in
Apache Drill by
Hi Alessandro,
Thanks for your feedback, the RelOptUtil#findAllTables requires its input
is a relNode, But many times we need extract all tables before validation,
this has the following advantages.
1. no metadata need and fast.
2. we can compose a on-demand catalog, rather get all schemas,
Hi Yanjing,
I found a discussion in the ML suggesting to use RelOptUtil#findAllTables
to get all tables involved in a query:
https://lists.apache.org/thread/wcfv2bhdytwsoyc3qlsnxcd7nmnnlb06
Can you check if that's what you want?
Best regards,
Alessandro
On Wed, 13 Apr 2022 at 09:33, Yanjing
Hi Commnunity,
In real scenarios, many developers want to get what tables a query
statement contains.
such as 'WITH t as (SELECT * FROM t1) SELECT * FROM t, t2', it only
contains table t1 and t2.
I tried to visit the SqlNode and found this solution is very complicated
and has very many checks,
