jonahgao commented on code in PR #13806:
URL: https://github.com/apache/datafusion/pull/13806#discussion_r1888671558
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datafusion/sql/src/expr/value.rs:
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@@ -315,45 +321,80 @@ const fn try_decode_hex_char(c: u8) -> Option<u8> {
}
}
-/// Parse Decimal128 from a string
-///
-/// TODO: support parsing from scientific notation
-fn parse_decimal_128(unsigned_number: &str, negative: bool) -> Result<Expr> {
- // remove leading zeroes
- let trimmed = unsigned_number.trim_start_matches('0');
- // Parse precision and scale, remove decimal point if exists
- let (precision, scale, replaced_str) = if trimmed == "." {
- // Special cases for numbers such as “0.”, “000.”, and so on.
- (1, 0, Cow::Borrowed("0"))
- } else if let Some(i) = trimmed.find('.') {
- (
- trimmed.len() - 1,
- trimmed.len() - i - 1,
- Cow::Owned(trimmed.replace('.', "")),
- )
- } else {
- // No decimal point, keep as is
- (trimmed.len(), 0, Cow::Borrowed(trimmed))
- };
+/// Callers ensure the value is within i256 range
Review Comment:
I reorganized it and tried to clarify it in
https://github.com/apache/datafusion/pull/13806/commits/49a4e0a58444a6969aba18d2c2992cf691560199
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