Feature: support expression table scan

[xudong963]

Summary

Currently, databend has ConstantTableScan which is mainly used by Values(...).

In https://github.com/datafuselabs/databend/issues/15255, Values contains a column that isn't the constant value but expression. To address the issue and improve the ability of Values(...), we should make ConstantTableScan more flexible and support ExpressionTableScan.

[inviscid]

Is there any estimate on when this might get selected for development?

[Dousir9]

Is there any estimate on when this might get selected for development?

@inviscid I am working on it and recursive cte.

[inviscid]

@Dousir9 Excellent to hear you picked this up. I was wondering if you had an ETA or need any help with testing.

[Dousir9]

@inviscid Thanks for your help, expect a PR within a week.