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|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| // 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::datatypes::DataType; | ||
| use datafusion_common::DataFusionError; | ||
| use datafusion_common::{exec_err, ScalarValue}; | ||
| use datafusion_expr::{ScalarUDFImpl, Signature, TypeSignature, Volatility}; | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct StructExtractFunc { | ||
| signature: Signature, | ||
| } | ||
|
|
||
| impl Default for StructExtractFunc { | ||
| fn default() -> Self { | ||
| Self::new() | ||
| } | ||
| } | ||
|
|
||
| impl StructExtractFunc { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| signature: Signature::one_of( | ||
| vec![TypeSignature::Any(2)], | ||
| Volatility::Immutable, | ||
| ), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl ScalarUDFImpl for StructExtractFunc { | ||
| fn as_any(&self) -> &dyn std::any::Any { | ||
| self | ||
| } | ||
|
|
||
| fn name(&self) -> &str { | ||
| "struct_extract" | ||
| } | ||
|
|
||
| fn signature(&self) -> &Signature { | ||
| &self.signature | ||
| } | ||
|
|
||
| fn return_type( | ||
| &self, | ||
| _arg_types: &[arrow::datatypes::DataType], | ||
| ) -> datafusion_common::Result<arrow::datatypes::DataType> { | ||
| exec_err!("should not call return type for struct extract function") | ||
| } | ||
|
|
||
| fn return_type_from_exprs( | ||
| &self, | ||
| args: &[datafusion_expr::Expr], | ||
| _schema: &dyn datafusion_common::ExprSchema, | ||
| arg_types: &[DataType], | ||
| ) -> datafusion_common::Result<DataType> { | ||
| if let DataType::Struct(fields) = &arg_types[0] { | ||
| match &arg_types[1] { | ||
| DataType::Int64 => { | ||
| if let datafusion_expr::Expr::Literal(ScalarValue::Int64(Some( | ||
| index, | ||
| ))) = &args[1] | ||
| { | ||
| if *index >= 0 && (*index as usize) < fields.len() { | ||
| return Ok(fields[*index as usize].data_type().clone()); | ||
| } else { | ||
| return exec_err!( | ||
| "Index {} is out of bounds for struct", | ||
| index | ||
| ); | ||
| } | ||
| } else { | ||
| return exec_err!("Expected an Int64 literal for field index"); | ||
| } | ||
| } | ||
| DataType::Utf8 => { | ||
| if let datafusion_expr::Expr::Literal(ScalarValue::Utf8(Some(name))) = | ||
| &args[1] | ||
| { | ||
| return fields | ||
| .iter() | ||
| .find(|field| field.name().eq(name)) | ||
| .map(|field| field.data_type().clone()) | ||
| .ok_or_else(|| DataFusionError::Execution(format!("Error finding name '{}' in the schema for struct extract function", name))); | ||
| } | ||
| } | ||
| _ => { | ||
| return exec_err!( | ||
| "not supported data type for struct extract function" | ||
| ); | ||
| } | ||
| } | ||
| } | ||
| exec_err!("not supported data type for struct extract function") | ||
| } | ||
| fn invoke( | ||
| &self, | ||
| args: &[datafusion_expr::ColumnarValue], | ||
| ) -> datafusion_common::Result<datafusion_expr::ColumnarValue> { | ||
| match &args[0] { | ||
| // Handle the case where the first argument is a StructArray | ||
| datafusion_expr::ColumnarValue::Array(array) => { | ||
| let struct_array = array | ||
| .as_any() | ||
| .downcast_ref::<arrow::array::StructArray>() | ||
| .ok_or_else(|| { | ||
| DataFusionError::Execution(format!( | ||
| "Failed to downcast to StructArray, got: {:?}", | ||
| args[0].data_type() | ||
| )) | ||
| })?; | ||
|
|
||
| extract_from_struct_array(struct_array, &args[1]) | ||
| } | ||
|
|
||
| // Handle the case where the first argument is ScalarValue::Struct | ||
| datafusion_expr::ColumnarValue::Scalar(ScalarValue::Struct( | ||
| arc_struct_array, | ||
| )) => { | ||
| let struct_array = arc_struct_array.as_ref(); | ||
| extract_from_struct_array(struct_array, &args[1]) | ||
| } | ||
|
|
||
| _ => Err(DataFusionError::Execution( | ||
| "First argument to struct_extract must be a struct".to_string(), | ||
| )), | ||
| } | ||
| } | ||
| } | ||
| // Extract data from a StructArray | ||
| fn extract_from_struct_array( | ||
| struct_array: &arrow::array::StructArray, | ||
| key: &datafusion_expr::ColumnarValue, | ||
| ) -> datafusion_common::Result<datafusion_expr::ColumnarValue> { | ||
| match key { | ||
| datafusion_expr::ColumnarValue::Scalar(ScalarValue::Int64(Some(index))) => { | ||
| if *index >= 0 && (*index as usize) < struct_array.num_columns() { | ||
| Ok(datafusion_expr::ColumnarValue::Array( | ||
| struct_array.column(*index as usize).clone(), | ||
| )) | ||
| } else { | ||
| exec_err!("Index {} is out of bounds for struct", index) | ||
| } | ||
| } | ||
| datafusion_expr::ColumnarValue::Scalar(ScalarValue::Utf8(Some(field_name))) => { | ||
| let field_index = struct_array | ||
| .fields() | ||
| .iter() | ||
| .position(|f| f.name() == field_name) | ||
| .ok_or_else(|| { | ||
| DataFusionError::Execution(format!( | ||
| "Field '{}' not found in struct", | ||
| field_name | ||
| )) | ||
| })?; | ||
| Ok(datafusion_expr::ColumnarValue::Array( | ||
| struct_array.column(field_index).clone(), | ||
| )) | ||
| } | ||
| _ => exec_err!( | ||
| "Second argument must be either an Int64 index or a Utf8 field name" | ||
| ), | ||
| } | ||
| } |