Struct ColumnChecker 

struct ColumnChecker<'a> {
    left_schema: &'a DFSchema,
    left_columns: Option<HashSet<Column>>,
    right_schema: &'a DFSchema,
    right_columns: Option<HashSet<Column>>,
}

Evaluates the columns referenced in the given expression to see if they refer only to the left or right columns

Fields

left_schema: &'a DFSchema

schema of left join input

left_columns: Option<HashSet<Column>>

columns in left_schema, computed on demand

right_schema: &'a DFSchema

schema of right join input

right_columns: Option<HashSet<Column>>

columns in left_schema, computed on demand

Implementations

impl<'a> ColumnChecker<'a>

fn new(left_schema: &'a DFSchema, right_schema: &'a DFSchema) -> Self

fn is_left_only(&mut self, predicate: &Expr) -> bool

Return true if the expression references only columns from the left side of the join

fn is_right_only(&mut self, predicate: &Expr) -> bool

Return true if the expression references only columns from the right side of the join

Trait Implementations

impl<'a> Debug for ColumnChecker<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.