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Make proper distinction between ambiguous and nonexistent column name

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Fixes #20
This commit is contained in:
Dan Spencer 2015-04-20 02:38:21 -06:00
parent 3ac37d4f1e
commit 2ee282a18d
2 changed files with 47 additions and 23 deletions
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15
src/queryplan/mod.rs
View File

@ -15,7 +15,7 @@ use self::source::*;
pub enum QueryPlanCompileError {
TableDoesNotExist(Identifier),
/// ambiguous column name; two or more tables have a column of the same name
ColumnDoesNotExist(Identifier),
AmbiguousColumnName(Identifier),
BadIdentifier(String),
BadStringLiteral(String),
@ -34,6 +34,9 @@ impl fmt::Display for QueryPlanCompileError {
&TableDoesNotExist(ref name) => {
write!(f, "table does not exist: {}", name)
},
&ColumnDoesNotExist(ref name) => {
write!(f, "column does not exist: {}", name)
},
&AmbiguousColumnName(ref name) => {
write!(f, "ambiguous column name: {}", name)
},
@ -510,8 +513,9 @@ where DB: 'a, <DB as DatabaseInfo>::Table: 'a
let column_identifier = try!(new_identifier(&s));
let (source_id, column_offset) = match scope.get_column_offset(&column_identifier) {
Some(v) => v,
None => return Err(QueryPlanCompileError::AmbiguousColumnName(column_identifier))
GetColumnOffsetResult::One(v) => v,
GetColumnOffsetResult::None => return Err(QueryPlanCompileError::ColumnDoesNotExist(column_identifier)),
GetColumnOffsetResult::Ambiguous(..) => return Err(QueryPlanCompileError::AmbiguousColumnName(column_identifier))
};
groups_info.add_query_id(self.get_query_id_from_source_id(source_id));
@ -526,8 +530,9 @@ where DB: 'a, <DB as DatabaseInfo>::Table: 'a
let column_identifier = try!(new_identifier(&s2));
let (source_id, column_offset) = match scope.get_table_column_offset(&table_identifier, &column_identifier) {
Some(v) => v,
None => return Err(QueryPlanCompileError::AmbiguousColumnName(column_identifier))
GetColumnOffsetResult::One(v) => v,
GetColumnOffsetResult::None => return Err(QueryPlanCompileError::ColumnDoesNotExist(column_identifier)),
GetColumnOffsetResult::Ambiguous(..) => return Err(QueryPlanCompileError::AmbiguousColumnName(column_identifier))
};
groups_info.add_query_id(self.get_query_id_from_source_id(source_id));

55
src/queryplan/source.rs
View File

@ -13,6 +13,12 @@ pub struct SourceScope<'a>
table_aliases: Vec<Identifier>
}
pub enum GetColumnOffsetResult {
One((u32, u32)),
None,
Ambiguous(Vec<(u32, u32)>)
}
fn get_candidates<'a, I>(tables: I, name: &Identifier) -> Vec<(u32, u32)>
where I: Iterator<Item=&'a TableOrSubquery>
{
@ -39,21 +45,38 @@ impl<'a> SourceScope<'a> {
pub fn tables(&self) -> &[TableOrSubquery] { &self.tables }
pub fn get_column_offset(&self, column_name: &Identifier) -> Option<(u32, u32)> {
let mut candidates = get_candidates(self.tables.iter(), column_name);
candidates.extend(self.parent.and_then(|parent| {
parent.get_column_offset(column_name)
}).into_iter());
pub fn get_column_offset(&self, column_name: &Identifier) -> GetColumnOffsetResult {
let candidates = self.get_column_offsets(column_name);
if candidates.len() == 1 {
Some(candidates[0])
} else {
None
match candidates.len() {
0 => GetColumnOffsetResult::None,
1 => GetColumnOffsetResult::One(candidates[0]),
_ => GetColumnOffsetResult::Ambiguous(candidates)
}
}
pub fn get_table_column_offset(&self, table_name: &Identifier, column_name: &Identifier) -> Option<(u32, u32)> {
pub fn get_table_column_offset(&self, table_name: &Identifier, column_name: &Identifier) -> GetColumnOffsetResult {
let candidates = self.get_table_column_offsets(table_name, column_name);
match candidates.len() {
0 => GetColumnOffsetResult::None,
1 => GetColumnOffsetResult::One(candidates[0]),
_ => GetColumnOffsetResult::Ambiguous(candidates)
}
}
fn get_column_offsets(&self, column_name: &Identifier) -> Vec<(u32, u32)> {
let mut candidates = get_candidates(self.tables.iter(), column_name);
if let Some(parent) = self.parent {
candidates.extend(parent.get_column_offsets(column_name));
}
candidates
}
fn get_table_column_offsets(&self, table_name: &Identifier, column_name: &Identifier) -> Vec<(u32, u32)> {
let tables = self.table_aliases.iter().enumerate().filter_map(|(i, name)| {
if name == table_name { Some(&self.tables[i]) }
else { None }
@ -61,14 +84,10 @@ impl<'a> SourceScope<'a> {
let mut candidates = get_candidates(tables, column_name);
candidates.extend(self.parent.and_then(|parent| {
parent.get_table_column_offset(table_name, column_name)
}).into_iter());
if candidates.len() == 1 {
Some(candidates[0])
} else {
None
if let Some(parent) = self.parent {
candidates.extend(parent.get_table_column_offsets(table_name, column_name));
}
candidates
}
}