alamb commented on code in PR #13372:
URL: https://github.com/apache/datafusion/pull/13372#discussion_r1876234505
##########
datafusion/expr-common/src/signature.rs:
##########
@@ -138,6 +141,48 @@ pub enum TypeSignature {
NullAry,
}
+impl TypeSignature {
+ #[inline]
+ pub fn is_one_of(&self) -> bool {
+ matches!(self, TypeSignature::OneOf(_))
+ }
+}
+
+#[derive(Debug, Clone, Eq, PartialOrd)]
+pub enum TypeSignatureClass {
+ Timestamp,
Review Comment:
I think some functions currently define that they take a UTC timestamp or
ANY timestamp via
https://docs.rs/datafusion/latest/datafusion/logical_expr/constant.TIMEZONE_WILDCARD.html
##########
datafusion/expr-common/src/signature.rs:
##########
@@ -138,6 +141,48 @@ pub enum TypeSignature {
NullAry,
}
+impl TypeSignature {
+ #[inline]
+ pub fn is_one_of(&self) -> bool {
+ matches!(self, TypeSignature::OneOf(_))
+ }
+}
+
+#[derive(Debug, Clone, Eq, PartialOrd)]
+pub enum TypeSignatureClass {
+ Timestamp,
+ Date,
+ Time,
+ Interval,
+ Duration,
+ // TODO:
+ // Numeric
+ // Integer
+ Native(LogicalTypeRef),
+}
+
+// TODO: MSRV issue: Default macro doesn't work in 1.79. Use default PartialEq
macro after it is able to compile
+impl PartialEq for TypeSignatureClass {
+ fn eq(&self, other: &Self) -> bool {
+ match (self, other) {
+ (Self::Native(l0), Self::Native(r0)) => l0 == r0,
+ _ => core::mem::discriminant(self) ==
core::mem::discriminant(other),
+ }
+ }
+}
+
+impl std::hash::Hash for TypeSignatureClass {
+ fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+ core::mem::discriminant(self).hash(state);
+ }
+}
+
+impl Display for TypeSignatureClass {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ write!(f, "TypeSignatureClass::{self:?}")
Review Comment:
I agree it would be great to have a special type signature class display
Maybe something like `(any int)` or `Integer` or `(any timestamp)` for
Timestamp 🤔
##########
datafusion/sqllogictest/test_files/expr.slt:
##########
@@ -1100,24 +1100,22 @@ SELECT date_part('microsecond', timestamp
'2020-09-08T12:00:12.12345678+00:00')
query error DataFusion error: Internal error: unit Nanosecond not supported
SELECT date_part('nanosecond', timestamp '2020-09-08T12:00:12.12345678+00:00')
-
-query I
+# Second argument should not be string, failed in postgres too.
+query error
Review Comment:
this feels like a regression to me (even if it fails in postgres). I think
automatically coercing to a string is important for our users in InfluxDB.
##########
datafusion/expr-common/src/signature.rs:
##########
@@ -154,6 +156,25 @@ impl TypeSignature {
}
}
+#[derive(Debug, Clone, Eq, PartialEq, PartialOrd, Hash)]
+pub enum TypeSignatureClass {
Review Comment:
Would it be possible to add doc comments to this enum explaining what it is
and what it is used for?
##########
datafusion/common/src/types/native.rs:
##########
@@ -245,6 +245,8 @@ impl LogicalType for NativeType {
(Self::FixedSizeBinary(size), _) => FixedSizeBinary(*size),
(Self::String, LargeBinary) => LargeUtf8,
(Self::String, BinaryView) => Utf8View,
+ // We don't cast to another kind of string type if the origin one
is already a string type
Review Comment:
💯
##########
datafusion/expr-common/src/signature.rs:
##########
@@ -290,7 +311,24 @@ impl TypeSignature {
.collect(),
TypeSignature::Coercible(types) => types
.iter()
- .map(|logical_type| get_data_types(logical_type.native()))
+ .map(|logical_type| match logical_type {
+ TypeSignatureClass::Native(l) =>
get_data_types(l.native()),
+ TypeSignatureClass::Timestamp => {
+ vec![DataType::Timestamp(TimeUnit::Nanosecond, None)]
Review Comment:
I think this should use WILDCARD to match any timestamp (not just timestamps
without timezones)
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