Module project 

Structs

AliasedExpr

Auxiliary struct for displaying expr AS alias

Project

Project computes a set of expressions from its input relation.

ProjectBuilder

Construct a Project and dedup expressions. expressions

Constants

LOCAL_PHASE_VNODE_COLUMN_NAME

The name of the vnode column added by Project::with_vnode_col, used as the group key for local phase of aggregation or top-n under two-phase optimization.

Functions

check_expr_type 🔒

ensure_sorted_required_cols

Given the index of required cols, return a vec of permutation index, so that after we sort the required_cols, and re-apply with a projection with the permutation index, we can restore the original required_cols.