Expand description
Core expression language.
Modules
Utility functions to transform parts of a single MirRelationExpr
into canonical form.
This module houses a pretty printer for MirRelationExprs.
Visitor support for recursive data types.
Structs
Describes an aggregation expression.
Specification for an ordering by a column.
A bare-minimum implementation of ExprHumanizer.
Any column in a join expression exists in two contexts:
The identifier for a local component of a dataflow.
A compound operator that can be applied row-by-row.
Predicates partitioned into temporal and non-temporal.
A MirRelationExpr that claims to have been optimized, e.g., by an
transform::Optimizer.
Instructions for finishing the result of a query.
A wrapper type which indicates it is safe to simply evaluate all expressions.
Unique identifier for an instantiation of a source.
Describe a window frame, e.g. RANGE UNBOUNDED PRECEDING or
ROWS BETWEEN 5 PRECEDING AND CURRENT ROW.
Enums
An opaque identifier for a dataflow component. In other words, identifies
the target of a MirRelationExpr::Get.
Describe a join implementation in dataflow.
Identify whether the given aggregate function is Lag or Lead, since they share implementations.
An abstract syntax tree which defines a collection.
Unique identifier for each part of a whole source. Kafka -> partition None -> sources that have no notion of partitioning (e.g file sources)
Specifies WindowFrame’s start_bound and end_bound
Describe how frame bounds are interpreted
Constants
A recursion limit to be used for stack-safe traversals of MirRelationExpr trees.
Traits
A trait for types that describe how to build a collection.
A trait for humanizing components of an expression.
Functions
Compare left and right using order. If that doesn’t produce a strict ordering, call tiebreaker.
Given the permutations (see permutation_for_arrangement and
(dataflow::plan::AvailableCollections) corresponding to two
collections with the same key arity,
computes the permutation for the result of joining them.
Recursively memoize parts of expr, storing those parts in memoized_parts.
Return the map associating columns in the logical,
unthinned representation of a collection to columns in the
thinned representation of the arrangement corresponding to key.