Module datafusion_physical_expr::expressions
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Defines physical expressions that can evaluated at runtime during query execution
Re-exports
pub use crate::aggregate::build_in::create_aggregate_expr;Modules
Module with some convenient methods used in expression building
Structs
APPROX_DISTINCT aggregate expression
MEDIAN aggregate expression
APPROX_PERCENTILE_CONT aggregate expression
APPROX_PERCENTILE_CONT_WITH_WEIGTH aggregate expression
ARRAY_AGG aggregate expression
AVG aggregate expression
An accumulator to compute the average
Binary expression
The CASE expression is similar to a series of nested if/else and there are two forms that can be used. The first form consists of a series of boolean “when” expressions with corresponding “then” expressions, and an optional “else” expression.
CAST expression casts an expression to a specific data type and returns a runtime error on invalid cast
Represents the column at a given index in a RecordBatch
CORR aggregate expression
COUNT aggregate expression Returns the amount of non-null values of the given expression.
COVAR and COVAR_SAMP aggregate expression
COVAR_POP aggregate expression
Perform DATE/TIME/TIMESTAMP +/ INTERVAL math
Expression for a ARRAY_AGG(DISTINCT) aggregation.
Expression for a COUNT(DISTINCT) aggregation.
Expression for a SUM(DISTINCT) aggregation.
expression to get a field of a struct array.
GROUPING aggregate expression Returns the amount of non-null values of the given expression.
InList
IS NOT NULL expression
IS NULL expression
Represents a literal value
MAX aggregate expression
An accumulator to compute the maximum value
MEDIAN aggregate expression. This uses a lot of memory because all values need to be stored in memory before a result can be computed. If an approximation is sufficient then APPROX_MEDIAN provides a much more efficient solution.
MIN aggregate expression
An accumulator to compute the minimum value
Negative expression
Not expression
nth_value expression
Represents Sort operation for a column in a RecordBatch
row_number expression
STDDEV and STDDEV_SAMP (standard deviation) aggregate expression
STDDEV_POP population aggregate expression
SUM aggregate expression
TRY_CAST expression casts an expression to a specific data type and retuns NULL on invalid cast
VAR and VAR_SAMP aggregate expression
VAR_POP aggregate expression
Enums
Enum used for differenciating population and sample for statistical functions
Constants
provide DataFusion default cast options
Functions
Create a binary expression whose arguments are correctly coerced. This function errors if it is not possible to coerce the arguments to computational types supported by the operator.
Create a CASE expression
Return a PhysicalExpression representing expr casted to
cast_type, if any casting is needed.
Internal cast function for casting ColumnarValue -> ColumnarValue for cast_type
Return a PhysicalExpression representing expr casted to
cast_type, if any casting is needed.
Create a column expression
Create a cume_dist window function
Create a dense rank window function
returns the name of the state
Creates a unary expression InList
Create an IS NOT NULL expression
Create an IS NULL expression
lag() window function
lead() window function
Create a literal expression
Creates a unary expression NEGATIVE
Creates a unary expression NOT
Implements NULLIF(expr1, expr2) Args: 0 - left expr is any array 1 - if the left is equal to this expr2, then the result is NULL, otherwise left value is passed.
Create a percent rank window function
Create a rank window function
Return a PhysicalExpression representing expr casted to
cast_type, if any casting is needed.