Module relation

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canonicalize: Utility functions to transform parts of a single MirRelationExpr into canonical form.
func
join_input_mapper
proto_aggregate_func: Nested message and enum types in ProtoAggregateFunc.
proto_table_func: Nested message and enum types in ProtoTableFunc.
proto_window_frame: Nested message and enum types in ProtoWindowFrame.
structured_diff 🔒: An iterator over AST structures, which calls out nodes in difference.

AggregateExpr: Describes an aggregation expression.
ColumnOrder: Specification for an ordering by a column.
JoinInputCharacteristicsV1: Old version of JoinInputCharacteristics, with enable_join_prioritize_arranged turned off.
JoinInputCharacteristicsV2: Newer version of JoinInputCharacteristics, with enable_join_prioritize_arranged turned on.
LetRecLimit: Maximum iterations for a LetRec.
ProtoAggregateExpr
ProtoAggregateFunc
ProtoColumnOrder
ProtoRowSetFinishing
ProtoTableFunc
ProtoWindowFrame
RowSetFinishing: Instructions for finishing the result of a query.
WindowFrame: Describe a window frame, e.g. RANGE UNBOUNDED PRECEDING or ROWS BETWEEN 5 PRECEDING AND CURRENT ROW.

AccessStrategy: For a global Get, this indicates whether we are going to read from Persist or from an index. (See comment in MirRelationExpr::Get.)
JoinImplementation: Describe a join implementation in dataflow.
JoinInputCharacteristics: Characteristics of a join order candidate collection.
MirRelationExpr: An abstract syntax tree which defines a collection.
WindowFrameBound: Specifies WindowFrame’s start_bound and end_bound
WindowFrameUnits: Describe how frame bounds are interpreted

RECURSION_LIMIT: A recursion limit to be used for stack-safe traversals of MirRelationExpr trees.

compare_columns: Compare left and right using order. If that doesn’t produce a strict ordering, call tiebreaker.
non_nullable_columns: Augment non-nullability of columns, by observing either