Signed-off-by: YangKeao yangkeao@chunibyo.icu

What problem does this PR solve?

Issue Number: close #39340

Problem Summary:

Use alter table remove ttl instead of alter table no_ttl. And remove the support of arbitrary expression, but only support valueExpr from Literal.

What is changed and how it works?

It changed three things:

1. Change the name of AlterTablePartitionOpt to AlterTableSingleSpecOpt and add a "REMOVE" "TTL" branch to it. We cannot add "REMOVE" "TTL" to other rules or AlterTableSpec because yacc has to know whether to reduce the AlterTableSpec and moving forward to AlterTablePartitionOpt, or try to "REMOVE" "TTL"
2. Change the value of "TTL" config to valueExpr. Maybe we could modify it to DefaultValueExpr or other wider range grammar later, but supporing number / string literal is enough for today.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Release note

Change grammar to remove ttl from `ALTER table NO_TTL` to `ALTER table REMOVE TTL`