Enum ProjectExpr 

pub enum ProjectExpr {
    Column(usize),
    Constant(Value),
    PropertyAccess {
        column: usize,
        property: String,
    },
    EdgeType {
        column: usize,
    },
    Expression {
        expr: FilterExpression,
        variable_columns: HashMap<String, usize>,
    },
    NodeResolve {
        column: usize,
    },
    EdgeResolve {
        column: usize,
    },
}

A projection expression.

Variants

Column(usize)

Reference to an input column.

Constant(Value)

A constant value.

PropertyAccess

Property access on a node/edge column.

Fields

column: usize

The column containing the node or edge ID.

property: String

The property name to access.

EdgeType

Edge type accessor (for type(r) function).

Fields

column: usize

The column containing the edge ID.

Expression

Full expression evaluation (for CASE WHEN, etc.).

Fields

expr: FilterExpression

The filter expression to evaluate.

variable_columns: HashMap<String, usize>

Variable name to column index mapping.

NodeResolve

Resolve a node ID column to a full node map with metadata and properties.

Fields

column: usize

The column containing the node ID.

EdgeResolve

Resolve an edge ID column to a full edge map with metadata and properties.

Fields

column: usize

The column containing the edge ID.