tustvold commented on code in PR #3209:
URL: https://github.com/apache/arrow-rs/pull/3209#discussion_r1033541345
##########
arrow-csv/src/reader.rs:
##########
@@ -70,9 +70,11 @@ lazy_static! {
.case_insensitive(true)
.build()
.unwrap();
- static ref DATE_RE: Regex = Regex::new(r"^\d{4}-\d\d-\d\d$").unwrap();
+ static ref DATE32_RE: Regex = Regex::new(r"^\d{4}-\d\d-\d\d$").unwrap();
+ static ref DATE64_RE: Regex =
+ Regex::new(r"^\d{4}-\d\d-\d\d(T|\s)\d\d:\d\d:\d\d$").unwrap();
static ref DATETIME_RE: Regex =
- Regex::new(r"^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d$").unwrap();
+
Regex::new(r"^\d{4}-\d\d-\d\d(T|\s)\d\d:\d\d:\d\d(.\d{1,9})?$").unwrap();
Review Comment:
```suggestion
Regex::new(r"^\d{4}-\d\d-\d\d[T
]\d\d:\d\d:\d\d(.\d{1,9})?$").unwrap();
```
Or at the very least a non-capturing group. I also think it should probably
be ` ` instead of `\s` as things like `\n` or `\t` I don't think would parse
correctly.
##########
arrow-csv/src/reader.rs:
##########
@@ -90,10 +92,12 @@ fn infer_field_schema(string: &str, datetime_re:
Option<Regex>) -> DataType {
DataType::Float64
} else if INTEGER_RE.is_match(string) {
DataType::Int64
- } else if datetime_re.is_match(string) {
- DataType::Date64
- } else if DATE_RE.is_match(string) {
+ } else if DATE32_RE.is_match(string) {
Review Comment:
FWIW I created #3211 to track using a RegexSet here, as the current code is
rather wasteful, perhaps something for a follow on PR?
##########
arrow-csv/src/reader.rs:
##########
@@ -70,9 +70,11 @@ lazy_static! {
.case_insensitive(true)
.build()
.unwrap();
- static ref DATE_RE: Regex = Regex::new(r"^\d{4}-\d\d-\d\d$").unwrap();
+ static ref DATE32_RE: Regex = Regex::new(r"^\d{4}-\d\d-\d\d$").unwrap();
+ static ref DATE64_RE: Regex =
+ Regex::new(r"^\d{4}-\d\d-\d\d(T|\s)\d\d:\d\d:\d\d$").unwrap();
Review Comment:
```suggestion
Regex::new(r"^\d{4}-\d\d-\d\d[T ]\d\d:\d\d:\d\d$").unwrap();
```
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