Module expression 

Expression system for GenomicFrame query language

This module provides the expression AST that GenomicFrame uses for building lazy query plans. Expressions can represent predicates, aggregations, and transformations that will later be compiled into actual filter operations.

Examples

use genomicframe_core::expression::{col, lit, Expr};

// Quality filter: qual > 30.0
let predicate = col("qual").gt(lit(30.0));

// Complex predicate: (qual > 30 AND is_snp) OR is_pass
let complex = col("qual").gt(lit(30.0))
    .and(Expr::IsSnp)
    .or(Expr::IsPass);

Structs

CompiledAndFilter

CompiledNotFilter

CompiledOrFilter

Enums

Expr

Expression in the GenomicFrame query language

ScalarValue

Scalar values that can appear in expressions

Traits

ExprToFilter

Trait for compiling expressions into record filters

Functions

col

Create a column reference expression

extract_f64

extract_i64

extract_string

extract_u8

extract_u32

extract_u64

extract_usize

lit

Create a literal value expression