Module expressions

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
• NthValue
  nth_value 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

Enums

• StatsType
  Module with some convenient methods used in expression building TODO: Move this to functions-aggregate module Enum used for differentiating population and sample for statistical functions

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.