Struct TypeInference 

pub struct TypeInference;

Type inference utilities

Implementations

impl TypeInference

pub fn infer_from_string(value: &str) -> InferredType

Infer the type of a single string value

This is the main entry point for type detection. Order of checks is important for performance and accuracy.

pub fn looks_like_datetime(value: &str) -> bool

Check if a string looks like a datetime value

Uses strict regex patterns to avoid false positives with ID strings like “BQ-123456” or “ORDER-2024-001”

pub fn merge_types(type1: InferredType, type2: InferredType) -> InferredType

Merge two types when a column has mixed types

Rules:

• Same type -> keep it
• Null with anything -> the other type
• Integer + Float -> Float
• Any numeric + String -> String
• DateTime + String -> String
• Everything else -> String

pub fn infer_from_samples<'a, I>(values: I) -> InferredType

where I: Iterator<Item = &'a str>,

Infer type from multiple sample values

Useful for determining column type from a sample of rows. Returns the most specific type that fits all non-null values.

pub fn can_coerce_to(value: &str, target_type: InferredType) -> bool

Check if a value can be coerced to a specific type