forked from apache/datafusion
-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Support custom struct field names with new scalar function named_stru…
…ct (apache#9743) * Support custom struct field names with new scalar function named_struct * add tests and corretly handle mixed arrray and scalar values * fix slt * fmt * port test to slt --------- Co-authored-by: Andrew Lamb <[email protected]>
- Loading branch information
Showing
6 changed files
with
343 additions
and
27 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,148 @@ | ||
| // 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::StructArray; | ||
| use arrow::datatypes::{DataType, Field, Fields}; | ||
| use datafusion_common::{exec_err, internal_err, Result, ScalarValue}; | ||
| use datafusion_expr::{ColumnarValue, Expr, ExprSchemable}; | ||
| use datafusion_expr::{ScalarUDFImpl, Signature, Volatility}; | ||
| use std::any::Any; | ||
| use std::sync::Arc; | ||
|
|
||
| /// put values in a struct array. | ||
| fn named_struct_expr(args: &[ColumnarValue]) -> Result<ColumnarValue> { | ||
| // do not accept 0 arguments. | ||
| if args.is_empty() { | ||
| return exec_err!( | ||
| "named_struct requires at least one pair of arguments, got 0 instead" | ||
| ); | ||
| } | ||
|
|
||
| if args.len() % 2 != 0 { | ||
| return exec_err!( | ||
| "named_struct requires an even number of arguments, got {} instead", | ||
| args.len() | ||
| ); | ||
| } | ||
|
|
||
| let (names, values): (Vec<_>, Vec<_>) = args | ||
| .chunks_exact(2) | ||
| .enumerate() | ||
| .map(|(i, chunk)| { | ||
|
|
||
| let name_column = &chunk[0]; | ||
|
|
||
| let name = match name_column { | ||
| ColumnarValue::Scalar(ScalarValue::Utf8(Some(name_scalar))) => name_scalar, | ||
| _ => return exec_err!("named_struct even arguments must be string literals, got {name_column:?} instead at position {}", i * 2) | ||
| }; | ||
|
|
||
| Ok((name, chunk[1].clone())) | ||
| }) | ||
| .collect::<Result<Vec<_>>>()? | ||
| .into_iter() | ||
| .unzip(); | ||
|
|
||
| let arrays = ColumnarValue::values_to_arrays(&values)?; | ||
|
|
||
| let fields = names | ||
| .into_iter() | ||
| .zip(arrays) | ||
| .map(|(name, value)| { | ||
| ( | ||
| Arc::new(Field::new(name, value.data_type().clone(), true)), | ||
| value, | ||
| ) | ||
| }) | ||
| .collect::<Vec<_>>(); | ||
|
|
||
| Ok(ColumnarValue::Array(Arc::new(StructArray::from(fields)))) | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| pub(super) struct NamedStructFunc { | ||
| signature: Signature, | ||
| } | ||
|
|
||
| impl NamedStructFunc { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| signature: Signature::variadic_any(Volatility::Immutable), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl ScalarUDFImpl for NamedStructFunc { | ||
| fn as_any(&self) -> &dyn Any { | ||
| self | ||
| } | ||
|
|
||
| fn name(&self) -> &str { | ||
| "named_struct" | ||
| } | ||
|
|
||
| fn signature(&self) -> &Signature { | ||
| &self.signature | ||
| } | ||
|
|
||
| fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> { | ||
| internal_err!( | ||
| "named_struct: return_type called instead of return_type_from_exprs" | ||
| ) | ||
| } | ||
|
|
||
| fn return_type_from_exprs( | ||
| &self, | ||
| args: &[datafusion_expr::Expr], | ||
| schema: &dyn datafusion_common::ExprSchema, | ||
| _arg_types: &[DataType], | ||
| ) -> Result<DataType> { | ||
| // do not accept 0 arguments. | ||
| if args.is_empty() { | ||
| return exec_err!( | ||
| "named_struct requires at least one pair of arguments, got 0 instead" | ||
| ); | ||
| } | ||
|
|
||
| if args.len() % 2 != 0 { | ||
| return exec_err!( | ||
| "named_struct requires an even number of arguments, got {} instead", | ||
| args.len() | ||
| ); | ||
| } | ||
|
|
||
| let return_fields = args | ||
| .chunks_exact(2) | ||
| .enumerate() | ||
| .map(|(i, chunk)| { | ||
| let name = &chunk[0]; | ||
| let value = &chunk[1]; | ||
|
|
||
| if let Expr::Literal(ScalarValue::Utf8(Some(name))) = name { | ||
| Ok(Field::new(name, value.get_type(schema)?, true)) | ||
| } else { | ||
| exec_err!("named_struct even arguments must be string literals, got {name} instead at position {}", i * 2) | ||
| } | ||
| }) | ||
| .collect::<Result<Vec<Field>>>()?; | ||
| Ok(DataType::Struct(Fields::from(return_fields))) | ||
| } | ||
|
|
||
| fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> { | ||
| named_struct_expr(args) | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.