s5dsn-eqee commented on code in PR #2557:
URL:
https://github.com/apache/datafusion-sqlparser-rs/pull/2557#discussion_r4306685232
##########
src/parser/mod.rs:
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@@ -12904,6 +12904,9 @@ impl<'a> Parser<'a> {
let _guard = self.recursion_counter.try_decrease()?;
let dialect = self.dialect;
+ if let Some(custom) = self.maybe_parse(|p|
p.parse_type_with_signed_modifier())? {
Review Comment:
Thanks for the update.
The location concern still stands, and the new code made it clearer why.
**The flag names one case but enables three**
1. signed numbers: `CHAR(-1)`, `CHAR(+10)`
2. fractional modifiers: `VARCHAR(2.5)`, `NUMERIC(10.5)`
3. oversized precision: `DECIMAL(99999999999999999999999, 2)`
Only the first is new syntax (`Expected: literal int, found: -`). The
other two already tokenize as a single number and fail inside
`parse_literal_uint`, because `DataType` stores
precision as `u64`. A boolean flag has to describe that slice in its name.
A parse hook does not.
**Why I'd still prefer the `parse_data_type` hook**
- The lookahead and custom parse move to `sqlite.rs` next to the
`parse_statement` override. The common parser keeps one line.
- `supports_signed_type_modifier` goes away, so there is no naming problem.
- Every helper the two functions use is already `pub`, so nothing else
changes.
**Scope note**
This path produces `DataType::Custom`, so `INT(10)` and `INT(-1)` get
different AST shapes. That is fine for SQLite, which ignores modifier values,
but it is not a base for other
dialects. Supporting these modifiers generally means a precision type
richer than `u64` in `DataType`, which is a separate AST refactor. Keeping this
SQLite-only behind a hook avoids
committing the common parser to `Custom` before that decision.
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