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use crate::common::DataType;
use crate::common::{ColumnDefinition, FQName};
use itertools::Itertools;
use std::fmt::{Display, Formatter};
/// Data for the create function statement
#[derive(PartialEq, Debug, Clone)]
pub struct CreateFunction {
/// if specified the 'OR REPLACE' clause will be added.
pub or_replace: bool,
/// if specified the 'NOT EXISTS' clause will be added.
pub not_exists: bool,
/// the name of the function.
pub name: FQName,
/// the parameters for the function.
pub params: Vec<ColumnDefinition>,
/// if set the function should return `NULL`` when called with `NULL`` otherwise
/// the function should process the input.
pub return_null: bool,
/// the data type the function returns.
pub return_type: DataType,
/// the language the function is written in.
pub language: String,
/// the code block containing the function
pub code_block: String,
}
impl Display for CreateFunction {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(
f,
"CREATE {}FUNCTION {}{} ({}) {} ON NULL INPUT RETURNS {} LANGUAGE {} AS {}",
if self.or_replace { "OR REPLACE " } else { "" },
if self.not_exists {
"IF NOT EXISTS "
} else {
""
},
self.name,
self.params.iter().map(|x| x.to_string()).join(", "),
if self.return_null {
"RETURNS NULL"
} else {
"CALLED"
},
self.return_type,
self.language,
self.code_block
)
}
}