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Posted to issues@sedona.apache.org by "yutannihilation (via GitHub)" <gi...@apache.org> on 2025/10/29 09:48:20 UTC
[PR] feat(sql): Implement ST_PointN [sedona-db]
yutannihilation opened a new pull request, #255:
URL: https://github.com/apache/sedona-db/pull/255
https://postgis.net/docs/manual-3.5/en/ST_PointN.html
- [ ] Add Python tests
- [ ] Add benchmark
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Re: [PR] feat(sql): Implement ST_PointN [sedona-db]
Posted by "paleolimbot (via GitHub)" <gi...@apache.org>.
paleolimbot merged PR #255:
URL: https://github.com/apache/sedona-db/pull/255
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Re: [PR] feat(sql): Implement ST_PointN [sedona-db]
Posted by "yutannihilation (via GitHub)" <gi...@apache.org>.
yutannihilation commented on PR #255:
URL: https://github.com/apache/sedona-db/pull/255#issuecomment-3465956734
Thanks, agreed!
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Re: [PR] feat(sql): Implement ST_PointN [sedona-db]
Posted by "yutannihilation (via GitHub)" <gi...@apache.org>.
yutannihilation commented on code in PR #255:
URL: https://github.com/apache/sedona-db/pull/255#discussion_r2475833280
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -356,6 +366,38 @@ impl TypeMatcher for IsNumeric {
}
}
+#[derive(Debug)]
+struct IsInteger {}
+
+impl TypeMatcher for IsInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
Review Comment:
Ah, thanks for catching!
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -356,6 +366,38 @@ impl TypeMatcher for IsNumeric {
}
}
+#[derive(Debug)]
+struct IsInteger {}
+
+impl TypeMatcher for IsInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
+ }
+}
+
+#[derive(Debug)]
+struct IsUnsignedInteger {}
+
+impl TypeMatcher for IsUnsignedInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_unsigned_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
Review Comment:
Yeah, I was wondering about it... Maybe I should remove this? We can add when we find this is actually useful.
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Re: [PR] feat(sql): Implement ST_PointN [sedona-db]
Posted by "paleolimbot (via GitHub)" <gi...@apache.org>.
paleolimbot commented on code in PR #255:
URL: https://github.com/apache/sedona-db/pull/255#discussion_r2476255960
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -356,6 +366,38 @@ impl TypeMatcher for IsNumeric {
}
}
+#[derive(Debug)]
+struct IsInteger {}
+
+impl TypeMatcher for IsInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Int64))
+ }
+}
+
+#[derive(Debug)]
+struct IsUnsignedInteger {}
+
+impl TypeMatcher for IsUnsignedInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_unsigned_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::UInt64))
+ }
+}
+
Review Comment:
```suggestion
```
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -455,6 +497,16 @@ mod tests {
Some(SedonaType::Arrow(DataType::Float64))
);
+ assert!(ArgMatcher::is_integer().match_type(&SedonaType::Arrow(DataType::UInt32)));
+ assert!(ArgMatcher::is_integer().match_type(&SedonaType::Arrow(DataType::Int32)));
+ assert!(!ArgMatcher::is_integer().match_type(&SedonaType::Arrow(DataType::Float64)));
+
+ assert!(ArgMatcher::is_unsigned_integer().match_type(&SedonaType::Arrow(DataType::UInt32)));
+ assert!(!ArgMatcher::is_unsigned_integer().match_type(&SedonaType::Arrow(DataType::Int32)));
+ assert!(
+ !ArgMatcher::is_unsigned_integer().match_type(&SedonaType::Arrow(DataType::Float64))
+ );
+
Review Comment:
```suggestion
```
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Re: [PR] feat(sql): Implement ST_PointN [sedona-db]
Posted by "paleolimbot (via GitHub)" <gi...@apache.org>.
paleolimbot commented on code in PR #255:
URL: https://github.com/apache/sedona-db/pull/255#discussion_r2473651318
##########
rust/sedona-functions/src/st_pointn.rs:
##########
@@ -0,0 +1,286 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+use arrow_array::builder::BinaryBuilder;
+use arrow_schema::DataType;
+use datafusion_common::{error::Result, ScalarValue};
+use datafusion_expr::{
+ scalar_doc_sections::DOC_SECTION_OTHER, ColumnarValue, Documentation, Volatility,
+};
+use geo_traits::{CoordTrait, GeometryTrait, LineStringTrait};
+use sedona_common::sedona_internal_err;
+use sedona_expr::scalar_udf::{SedonaScalarKernel, SedonaScalarUDF};
+use sedona_geometry::{
+ error::SedonaGeometryError,
+ wkb_factory::{write_wkb_coord_trait, write_wkb_point_header, WKB_MIN_PROBABLE_BYTES},
+};
+use sedona_schema::{
+ datatypes::{SedonaType, WKB_GEOMETRY},
+ matchers::ArgMatcher,
+};
+use std::{io::Write, sync::Arc};
+
+use crate::executor::WkbExecutor;
+
+/// ST_PointN() scalar UDF
+///
+/// Native implementation to get the nth point of a LINESTRING geometry.
+pub fn st_pointn_udf() -> SedonaScalarUDF {
+ SedonaScalarUDF::new(
+ "st_pointn",
+ vec![Arc::new(STPointN::new())],
+ Volatility::Immutable,
+ Some(st_pointn_doc()),
+ )
+}
+
+fn st_pointn_doc() -> Documentation {
+ Documentation::builder(
+ DOC_SECTION_OTHER,
+ "Returns the nth point of a geometry. Returns NULL if the geometry is empty or not a LINESTRING. Negative values are counted backwards from the end.",
+ "ST_PointN (geom: Geometry, n: integer)",
+ )
+ .with_argument("geom", "geometry: Input geometry")
+ .with_argument("n", "n: Index")
+ .with_sql_example("SELECT ST_PointN(ST_GeomFromWKT('LINESTRING(0 1, 2 3, 4 5)'), 2)")
+ .build()
+}
+
+#[derive(Debug)]
+struct STPointN;
+
+impl STPointN {
+ fn new() -> Self {
+ Self
+ }
+}
Review Comment:
```suggestion
impl STPointN {}
```
(For all the other kernels we skip the `new()` since they are only constructed in one place)
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -356,6 +366,38 @@ impl TypeMatcher for IsNumeric {
}
}
+#[derive(Debug)]
+struct IsInteger {}
+
+impl TypeMatcher for IsInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
Review Comment:
```suggestion
Some(SedonaType::Arrow(DataType::Int64))
```
##########
rust/sedona-schema/src/matchers.rs:
##########
@@ -356,6 +366,38 @@ impl TypeMatcher for IsNumeric {
}
}
+#[derive(Debug)]
+struct IsInteger {}
+
+impl TypeMatcher for IsInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
+ }
+}
+
+#[derive(Debug)]
+struct IsUnsignedInteger {}
+
+impl TypeMatcher for IsUnsignedInteger {
+ fn match_type(&self, arg: &SedonaType) -> bool {
+ match arg {
+ SedonaType::Arrow(data_type) => data_type.is_unsigned_integer(),
+ _ => false,
+ }
+ }
+
+ fn type_if_null(&self) -> Option<SedonaType> {
+ Some(SedonaType::Arrow(DataType::Float64))
Review Comment:
```suggestion
Some(SedonaType::Arrow(DataType::UInt64))
```
Do we need specifically unsigned integers for anything at the type matching level? It would probably be a better error coming from a kernel like "some_parameter must be greater than zero" than a planning error like "no kernel matching args ...".
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