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[GitHub] [arrow] AlenkaF opened a new pull request, #12863: ARROW-11259: [Python] Allow to create field reference to nested field
AlenkaF opened a new pull request, #12863:
URL: https://github.com/apache/arrow/pull/12863
This PR tries to redo the work from https://github.com/apache/arrow/pull/9799.
It will unblock:
- https://issues.apache.org/jira/browse/ARROW-13798
- https://issues.apache.org/jira/browse/ARROW-14596
cc @jorisvandenbossche @pitrou
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[GitHub] [arrow] lidavidm commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
lidavidm commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848356453
##########
python/pyarrow/compute.py:
##########
@@ -597,16 +597,29 @@ def field(name_or_index):
Stores only the field's name. Type and other information is known only when
the expression is bound to a dataset having an explicit scheme.
+ Nested references are allowed by passing a tuple of names.
+ For example ``('foo', 'bar')`` references the field named "bar" inside
+ the field named "foo".
+
Parameters
----------
- name_or_index : string or int
- The name or index of the field the expression references to.
+ name_or_index : string, tuple or int
Review Comment:
I wonder if we should also allow dotted names (though that could get ambiguous), or else, allow `field("a", "b")` instead of requiring `field(("a", "b"))`. That said neither are essential here.
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,14 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
Review Comment:
Can we test a column projection as well somewhere here?
##########
python/pyarrow/_compute.pyx:
##########
@@ -2219,10 +2219,26 @@ cdef class Expression(_Weakrefable):
@staticmethod
def _field(name_or_idx not None):
- if isinstance(name_or_idx, str):
- return Expression.wrap(CMakeFieldExpression(tobytes(name_or_idx)))
- else:
+ cdef:
+ CFieldRef c_field
+
+ if isinstance(name_or_idx, int):
return Expression.wrap(CMakeFieldExpressionByIndex(name_or_idx))
+ else:
+ c_field = CFieldRef(<c_string> tobytes(name_or_idx))
+ return Expression.wrap(CMakeFieldExpression(c_field))
+
+ @staticmethod
+ def _nested_field(tuple names not None):
+ cdef:
+ vector[CFieldRef] nested
+
+ if len(names) == 0:
+ raise ValueError("nested field reference should be non-empty")
+ nested.reserve(len(names))
+ for name in names:
+ nested.push_back(CFieldRef(<c_string> tobytes(name)))
Review Comment:
We might want to file a follow up for nested field refs that use indices? ARROW-15658/#12664 are working on support for that.
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848476086
##########
cpp/src/arrow/compute/exec/expression_test.cc:
##########
@@ -1376,12 +1376,18 @@ TEST(Expression, SerializationRoundTrips) {
ExpectRoundTrips(field_ref("field"));
+ ExpectRoundTrips(field_ref(FieldRef("foo", "bar", "baz")));
Review Comment:
Will try to simplify.
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[GitHub] [arrow] pitrou closed pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
pitrou closed pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
URL: https://github.com/apache/arrow/pull/12863
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848475601
##########
python/pyarrow/compute.py:
##########
@@ -597,16 +597,29 @@ def field(name_or_index):
Stores only the field's name. Type and other information is known only when
the expression is bound to a dataset having an explicit scheme.
+ Nested references are allowed by passing a tuple of names.
+ For example ``('foo', 'bar')`` references the field named "bar" inside
+ the field named "foo".
+
Parameters
----------
- name_or_index : string or int
- The name or index of the field the expression references to.
+ name_or_index : string, tuple or int
+ The name or index of the (possibly nested) field the expression
+ references to.
Returns
-------
field_expr : Expression
"""
- return Expression._field(name_or_index)
+ if isinstance(name_or_index, str) or isinstance(name_or_index, int):
Review Comment:
🤩
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r849061122
##########
python/pyarrow/compute.py:
##########
@@ -597,16 +597,29 @@ def field(name_or_index):
Stores only the field's name. Type and other information is known only when
the expression is bound to a dataset having an explicit scheme.
+ Nested references are allowed by passing a tuple of names.
+ For example ``('foo', 'bar')`` references the field named "bar" inside
+ the field named "foo".
+
Parameters
----------
- name_or_index : string or int
- The name or index of the field the expression references to.
+ name_or_index : string, tuple or int
Review Comment:
I think that allowing `field("a", "b")` would make a lot of sense. Will try to implement it here and if I run into difficulties I will add a follow-up JIRA.
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r852186238
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,26 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
+
+ assert result['i64'] == [1, 4, 1, 4]
Review Comment:
🤦♀️🤷♀️ Thank you!
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[GitHub] [arrow] github-actions[bot] commented on pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #12863:
URL: https://github.com/apache/arrow/pull/12863#issuecomment-1096463815
https://issues.apache.org/jira/browse/ARROW-11259
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[GitHub] [arrow] pitrou commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
pitrou commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848416435
##########
cpp/src/arrow/compute/exec/expression_test.cc:
##########
@@ -1376,12 +1376,18 @@ TEST(Expression, SerializationRoundTrips) {
ExpectRoundTrips(field_ref("field"));
+ ExpectRoundTrips(field_ref(FieldRef("foo", "bar", "baz")));
Review Comment:
Do we have to spell out `field_ref(FieldRef("foo", "bar"))` explicitly or is it possible to simply write `field_ref("foo", "bar")`?
##########
python/pyarrow/compute.py:
##########
@@ -597,16 +597,29 @@ def field(name_or_index):
Stores only the field's name. Type and other information is known only when
the expression is bound to a dataset having an explicit scheme.
+ Nested references are allowed by passing a tuple of names.
+ For example ``('foo', 'bar')`` references the field named "bar" inside
+ the field named "foo".
+
Parameters
----------
- name_or_index : string or int
- The name or index of the field the expression references to.
+ name_or_index : string, tuple or int
+ The name or index of the (possibly nested) field the expression
+ references to.
Returns
-------
field_expr : Expression
"""
- return Expression._field(name_or_index)
+ if isinstance(name_or_index, str) or isinstance(name_or_index, int):
Review Comment:
Nit :-)
```suggestion
if isinstance(name_or_index, (str, int)):
```
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[GitHub] [arrow] pitrou commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
pitrou commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r850464777
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,26 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
+
+ assert result['i64'] == [1, 4, 1, 4]
Review Comment:
This one could be in another order, you should probably sort the result table before (using `Table.sort_by` perhaps).
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,26 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
+
+ assert result['i64'] == [1, 4, 1, 4]
+ assert result['f64'] == [1.0, 4.0, 1.0, 4.0]
+ assert sorted(result['group']) == [1, 1, 2, 2]
+ assert sorted(result['key']) == ['xxx', 'xxx', 'yyy', 'yyy']
+
+ projection = {
+ 'i64': ds.field('i64'),
+ 'f64': ds.field('f64'),
+ "new": ds.field(('struct', 'b')) == '1',
+ }
+ result = dataset.to_table(use_threads=True, columns=projection).to_pydict()
+
+ assert result['i64'] == [0, 1, 2, 3, 4, 0, 1, 2, 3, 4]
Review Comment:
Same here (sort the results)?
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r849060220
##########
python/pyarrow/_compute.pyx:
##########
@@ -2219,10 +2219,26 @@ cdef class Expression(_Weakrefable):
@staticmethod
def _field(name_or_idx not None):
- if isinstance(name_or_idx, str):
- return Expression.wrap(CMakeFieldExpression(tobytes(name_or_idx)))
- else:
+ cdef:
+ CFieldRef c_field
+
+ if isinstance(name_or_idx, int):
return Expression.wrap(CMakeFieldExpressionByIndex(name_or_idx))
+ else:
+ c_field = CFieldRef(<c_string> tobytes(name_or_idx))
+ return Expression.wrap(CMakeFieldExpression(c_field))
+
+ @staticmethod
+ def _nested_field(tuple names not None):
+ cdef:
+ vector[CFieldRef] nested
+
+ if len(names) == 0:
+ raise ValueError("nested field reference should be non-empty")
+ nested.reserve(len(names))
+ for name in names:
+ nested.push_back(CFieldRef(<c_string> tobytes(name)))
Review Comment:
https://issues.apache.org/jira/browse/ARROW-16180
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[GitHub] [arrow] AlenkaF commented on pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on PR #12863:
URL: https://github.com/apache/arrow/pull/12863#issuecomment-1098738984
Thank you for the comments @lidavidm @pitrou!
I _think_ this PR is ready for another round of review (the errors should be related to the S3fs) .
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r850530904
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,26 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
+
+ assert result['i64'] == [1, 4, 1, 4]
Review Comment:
Sure, will do 👍
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r848482152
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,14 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
Review Comment:
Sure, will do 👍
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[GitHub] [arrow] pitrou commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
pitrou commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r851999609
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -391,6 +393,26 @@ def test_dataset(dataset, dataset_reader):
assert sorted(result['group']) == [1, 2]
assert sorted(result['key']) == ['xxx', 'yyy']
+ condition = ds.field(('struct', 'b')) == '1'
+ result = dataset.to_table(use_threads=True, filter=condition).to_pydict()
+
+ assert result['i64'] == [1, 4, 1, 4]
Review Comment:
Ok, I pushed a commit to show better what I meant :-)
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[GitHub] [arrow] github-actions[bot] commented on pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #12863:
URL: https://github.com/apache/arrow/pull/12863#issuecomment-1096463849
:warning: Ticket **has not been started in JIRA**, please click 'Start Progress'.
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[GitHub] [arrow] AlenkaF commented on a diff in pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
AlenkaF commented on code in PR #12863:
URL: https://github.com/apache/arrow/pull/12863#discussion_r849220598
##########
cpp/src/arrow/compute/exec/expression_test.cc:
##########
@@ -1376,12 +1376,18 @@ TEST(Expression, SerializationRoundTrips) {
ExpectRoundTrips(field_ref("field"));
+ ExpectRoundTrips(field_ref(FieldRef("foo", "bar", "baz")));
Review Comment:
Currently it doesn't work, `FieldRef("foo", "bar")` needs to be spelled out.
<details>
<summary>Try 1: `field_ref("foo", "bar")`</summary>
<pre>
```
/Users/alenkafrim/repos/arrow/cpp/src/arrow/compute/exec/expression_test.cc:1379:20: error: no matching function for call to 'field_ref'
ExpectRoundTrips(field_ref("foo", "bar", "baz"));
^~~~~~~~~
/Users/alenkafrim/repos/arrow/cpp/src/arrow/compute/exec/expression.h:152:12: note: candidate function not viable: requires single argument 'ref', but 3 arguments were provided
Expression field_ref(FieldRef ref);
```
</pre>
</details>
<details>
<summary>Try 2: `field_ref(("foo", "bar"))`</summary>
<pre>
```
/Users/alenkafrim/repos/arrow/cpp/src/arrow/compute/exec/expression_test.cc:1379:31: warning: expression result unused [-Wunused-value]
ExpectRoundTrips(field_ref(("foo", "bar", "baz")));
```
</pre>
</details>
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[GitHub] [arrow] ursabot commented on pull request #12863: ARROW-11259: [Python] Allow to create field reference to nested field
Posted by GitBox <gi...@apache.org>.
ursabot commented on PR #12863:
URL: https://github.com/apache/arrow/pull/12863#issuecomment-1101411121
Benchmark runs are scheduled for baseline = 83dda5c312238a2ce6e4d553e689444a8f665606 and contender = e0668e2024a7929abf2b0d8b53d2886a2e3a3379. e0668e2024a7929abf2b0d8b53d2886a2e3a3379 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Finished :arrow_down:0.0% :arrow_up:0.0%] [ec2-t3-xlarge-us-east-2](https://conbench.ursa.dev/compare/runs/f6fc15a3fec745749234fdf7df3e19bb...bddad4a507804919b8f8c707aa51ade0/)
[Failed :arrow_down:0.5% :arrow_up:0.04%] [test-mac-arm](https://conbench.ursa.dev/compare/runs/6c2cf55ff1464790b003fa11f63af581...a462410cd9774e2f9cfbeda01817fc30/)
[Failed :arrow_down:0.0% :arrow_up:0.0%] [ursa-i9-9960x](https://conbench.ursa.dev/compare/runs/73d122407e934a1ca2e28862ce68e732...f9df59d6f4ff4650a6d8ce1139ff8cb5/)
[Finished :arrow_down:0.26% :arrow_up:0.0%] [ursa-thinkcentre-m75q](https://conbench.ursa.dev/compare/runs/b96295f65a47420da4f6259320c4328a...e3cc6be67f40436b8929cb61d714b81b/)
Buildkite builds:
[Finished] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ec2-t3-xlarge-us-east-2/builds/524| `e0668e20` ec2-t3-xlarge-us-east-2>
[Failed] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-test-mac-arm/builds/511| `e0668e20` test-mac-arm>
[Failed] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ursa-i9-9960x/builds/510| `e0668e20` ursa-i9-9960x>
[Finished] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ursa-thinkcentre-m75q/builds/521| `e0668e20` ursa-thinkcentre-m75q>
[Finished] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ec2-t3-xlarge-us-east-2/builds/523| `83dda5c3` ec2-t3-xlarge-us-east-2>
[Failed] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-test-mac-arm/builds/510| `83dda5c3` test-mac-arm>
[Failed] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ursa-i9-9960x/builds/509| `83dda5c3` ursa-i9-9960x>
[Finished] <https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-ursa-thinkcentre-m75q/builds/520| `83dda5c3` ursa-thinkcentre-m75q>
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java
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