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use {
crate::{
data::Schema, executor::types::ColumnInfo, Column, ComplexTableName, ExecuteError, Glue,
MetaRecipe, Payload, PlannedRecipe, Result, Value,
},
sqlparser::ast::{Expr, ObjectName},
};
impl Glue {
pub async fn delete(
&mut self,
table_name: &ObjectName,
selection: &Option<Expr>,
) -> Result<Payload> {
let ComplexTableName {
name: table_name,
database,
..
} = table_name.try_into()?;
let Schema {
column_defs,
indexes,
..
} = self
.get_database(&database)?
.fetch_schema(&table_name)
.await?
.ok_or(ExecuteError::TableNotExists)?;
let columns = column_defs
.clone()
.into_iter()
.map(|Column { name, .. }| ColumnInfo::of_name(name))
.collect::<Vec<ColumnInfo>>();
let filter = selection
.clone()
.map(|selection| {
PlannedRecipe::new(
MetaRecipe::new(selection)?.simplify_by_context(&*self.get_context()?)?,
&columns,
)
})
.unwrap_or(Ok(PlannedRecipe::TRUE))?;
let keys = self
.get_database(&database)?
.scan_data(&table_name)
.await?
.into_iter()
.filter_map(|(key, row)| {
let row = row.0;
let confirm_constraint = filter.confirm_constraint(&row);
match confirm_constraint {
Ok(true) => Some(Ok(key)),
Ok(false) => None,
Err(error) => Some(Err(error)),
}
})
.collect::<Result<Vec<Value>>>()?;
let num_keys = keys.len();
let database = &mut **self.get_mut_database(&None)?;
let result = database
.delete_data(&table_name, keys)
.await
.map(|_| Payload::Delete(num_keys))?;
for index in indexes.iter() {
index.reset(database, &table_name, &column_defs).await?;
}
Ok(result)
}
}
