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use {
crate::{data::get_name, AlterError, ExecuteError, Glue, Index, Result, SchemaDiff},
sqlparser::ast::{Expr, ObjectName, OrderByExpr},
};
impl Glue {
pub async fn create_index(
&mut self,
table: &ObjectName,
name: &ObjectName,
columns: &[OrderByExpr],
unique: bool,
if_not_exists: bool,
) -> Result<()> {
let name = name
.0
.last()
.ok_or(ExecuteError::QueryNotSupported)?
.value
.clone();
let table_name = get_name(table)?;
let database = &mut **self.get_mut_database(&None)?;
let schema = database
.fetch_schema(table_name)
.await?
.ok_or(ExecuteError::TableNotExists)?;
if schema.indexes.iter().any(|index| index.name == name) {
if !if_not_exists {
Err(AlterError::AlreadyExists(name).into())
} else {
Ok(())
}
} else {
let mut columns = columns.iter();
let column = columns.next().and_then(|column| match column.expr.clone() {
Expr::Identifier(ident) => Some(ident.value),
_ => None,
});
if columns.next().is_some() {
Err(AlterError::UnsupportedNumberOfIndexColumns(name).into())
} else if column
.as_ref()
.and_then(|column| {
schema
.column_defs
.iter()
.find(|column_def| &column_def.name == column)
})
.is_none()
{
Err(AlterError::ColumnNotFound(
table_name.clone(),
column.unwrap_or_else(|| String::from("NILL")),
)
.into())
} else if let Some(column) = column {
let schema = schema.clone();
let index = Index::new(name, column, unique);
index
.reset(database, table_name, &schema.column_defs)
.await?;
database
.alter_table(table_name, SchemaDiff::new_add_index(index))
.await
} else {
unreachable!()
}
}
}
}