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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| // 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 crate::error::{_internal_err, _plan_err}; | ||
| use crate::{DataFusionError, Result, ScalarValue}; | ||
| use arrow_schema::DataType; | ||
| use std::collections::HashMap; | ||
|
|
||
| /// The parameter value corresponding to the placeholder | ||
| #[derive(Debug, Clone)] | ||
| pub enum ParamValues { | ||
| /// for positional query parameters, like select * from test where a > $1 and b = $2 | ||
| LIST(Vec<ScalarValue>), | ||
| /// for named query parameters, like select * from test where a > $foo and b = $goo | ||
| MAP(HashMap<String, ScalarValue>), | ||
| } | ||
|
|
||
| impl ParamValues { | ||
| /// Verify parameter list length and type | ||
| pub fn verify(&self, expect: &Vec<DataType>) -> Result<()> { | ||
| match self { | ||
| ParamValues::LIST(list) => { | ||
| // Verify if the number of params matches the number of values | ||
| if expect.len() != list.len() { | ||
| return _plan_err!( | ||
| "Expected {} parameters, got {}", | ||
| expect.len(), | ||
| list.len() | ||
| ); | ||
| } | ||
|
|
||
| // Verify if the types of the params matches the types of the values | ||
| let iter = expect.iter().zip(list.iter()); | ||
| for (i, (param_type, value)) in iter.enumerate() { | ||
| if *param_type != value.data_type() { | ||
| return _plan_err!( | ||
| "Expected parameter of type {:?}, got {:?} at index {}", | ||
| param_type, | ||
| value.data_type(), | ||
| i | ||
| ); | ||
| } | ||
| } | ||
| Ok(()) | ||
| } | ||
| ParamValues::MAP(_) => { | ||
| // If it is a named query, variables can be reused, | ||
| // but the lengths are not necessarily equal | ||
| Ok(()) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub fn get_placeholders_with_values( | ||
| &self, | ||
| id: &String, | ||
| data_type: &Option<DataType>, | ||
| ) -> Result<ScalarValue> { | ||
| match self { | ||
| ParamValues::LIST(list) => { | ||
| if id.is_empty() || id == "$0" { | ||
| return _plan_err!("Empty placeholder id"); | ||
| } | ||
| // convert id (in format $1, $2, ..) to idx (0, 1, ..) | ||
| let idx = id[1..].parse::<usize>().map_err(|e| { | ||
| DataFusionError::Internal(format!( | ||
| "Failed to parse placeholder id: {e}" | ||
| )) | ||
| })? - 1; | ||
| // value at the idx-th position in param_values should be the value for the placeholder | ||
| let value = list.get(idx).ok_or_else(|| { | ||
| DataFusionError::Internal(format!( | ||
| "No value found for placeholder with id {id}" | ||
| )) | ||
| })?; | ||
| // check if the data type of the value matches the data type of the placeholder | ||
| if Some(value.data_type()) != *data_type { | ||
| return _internal_err!( | ||
| "Placeholder value type mismatch: expected {:?}, got {:?}", | ||
| data_type, | ||
| value.data_type() | ||
| ); | ||
| } | ||
| Ok(value.clone()) | ||
| } | ||
| ParamValues::MAP(map) => { | ||
| // convert name (in format $a, $b, ..) to mapped values (a, b, ..) | ||
| let name = &id[1..]; | ||
| // value at the name position in param_values should be the value for the placeholder | ||
| let value = map.get(name).ok_or_else(|| { | ||
| DataFusionError::Internal(format!( | ||
| "No value found for placeholder with name {id}" | ||
| )) | ||
| })?; | ||
| // check if the data type of the value matches the data type of the placeholder | ||
| if Some(value.data_type()) != *data_type { | ||
| return _internal_err!( | ||
| "Placeholder value type mismatch: expected {:?}, got {:?}", | ||
| data_type, | ||
| value.data_type() | ||
| ); | ||
| } | ||
| Ok(value.clone()) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl From<Vec<ScalarValue>> for ParamValues { | ||
| fn from(value: Vec<ScalarValue>) -> Self { | ||
| Self::LIST(value) | ||
| } | ||
| } | ||
|
|
||
| impl<K> From<Vec<(K, ScalarValue)>> for ParamValues | ||
| where | ||
| K: Into<String>, | ||
| { | ||
| fn from(value: Vec<(K, ScalarValue)>) -> Self { | ||
| let value: HashMap<String, ScalarValue> = | ||
| value.into_iter().map(|(k, v)| (k.into(), v)).collect(); | ||
| Self::MAP(value) | ||
| } | ||
| } | ||
|
|
||
| impl<K> From<HashMap<K, ScalarValue>> for ParamValues | ||
| where | ||
| K: Into<String>, | ||
| { | ||
| fn from(value: HashMap<K, ScalarValue>) -> Self { | ||
| let value: HashMap<String, ScalarValue> = | ||
| value.into_iter().map(|(k, v)| (k.into(), v)).collect(); | ||
| Self::MAP(value) | ||
| } | ||
| } |
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