Module datafusion_expr::utils
source · [−]Expand description
Expression utilities
Constants
The value to which COUNT(*)
is expanded to in
COUNT(<constant>)
expressions
Functions
can this data type be used in hash join equal conditions?? data types here come from function ‘equal_rows’, if more data types are supported in equal_rows(hash join), add those data types here to generate join logical plan.
Convert an expression into Column expression if it’s already provided as input plan.
Resolves an Expr::Wildcard
to a collection of qualified Expr::Column
’s.
Resolves an Expr::Wildcard
to a collection of Expr::Column
’s.
Convert any Expr
to an Expr::Column
.
Recursively walk an expression tree, collecting the unique set of columns referenced in the expression
Recursively walk a list of expression trees, collecting the unique set of columns referenced in the expression
Create field meta-data from an expression, for use in a result set schema
Collect all deeply nested Expr::AggregateFunction
and
Expr::AggregateUDF
. They are returned in order of occurrence (depth
first), with duplicates omitted.
Collect all deeply nested Expr::Column
’s. They are returned in order of
appearance (depth first), and may contain duplicates.
Collect all deeply nested Expr::Sort
. They are returned in order of occurrence
(depth first), with duplicates omitted.
Collect all deeply nested Expr::WindowFunction
. They are returned in order of occurrence
(depth first), with duplicates omitted.
Returns a new logical plan based on the original one with inputs and expressions replaced.
Generate a sort key for a given window expr’s partition_by and order_bu expr
group a slice of window expression expr by their order by expressions
Find all distinct exprs in a list of group by expressions. If the
first element is a GroupingSet
expression then it must be the only expr.