Module expressions

Expand description

Defines physical expressions that can evaluated at runtime during query execution

Structs§

BinaryExpr: Binary expression
CaseExpr: 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.
CastExpr: CAST expression casts an expression to a specific data type and returns a runtime error on invalid cast
Column: Represents the column at a given index in a RecordBatch
InListExpr: InList
IsNotNullExpr: IS NOT NULL expression
IsNullExpr: IS NULL expression
LikeExpr
Literal: Represents a literal value
NegativeExpr: Negative expression
NoOp: A place holder expression, can not be evaluated.
NotExpr: Not expression
PhysicalSortExpr: Represents Sort operation for a column in a RecordBatch
TryCastExpr: TRY_CAST expression casts an expression to a specific data type and returns NULL on invalid cast
UnKnownColumn

StatsType: TODO: Move this to functions-aggregate module Enum used for differentiating population and sample for statistical functions

binary: 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.
case: Create a CASE expression
cast: Return a PhysicalExpression representing expr casted to cast_type, if any casting is needed.
col: Create a column expression
format_state_name: Build state name. State is the intermediate state of the aggregate function.
in_list: Creates a unary expression InList
is_not_null: Create an IS NOT NULL expression
is_null: Create an IS NULL expression
like: Create a like expression, erroring if the argument types are not compatible.
lit: Create a literal expression
negative: Creates a unary expression NEGATIVE
not: Creates a unary expression NOT
similar_to: Create a similar to expression
try_cast: Return a PhysicalExpression representing expr casted to cast_type, if any casting is needed.
with_new_schema: Rewrites an expression according to new schema; i.e. changes the columns it refers to with the column at corresponding index in the new schema. Returns an error if the given schema has fewer columns than the original schema. Note that the resulting expression may not be valid if data types in the new schema is incompatible with expression nodes.