Infer the logical type of a character column

Classifies a character vector as "date", "numeric", "character", or "unknown" by applying rules in priority order.

Usage

infer_col_type(x, threshold = 0.9)

Arguments

x

Character vector to classify (as read from a CSV or FWF file).

threshold

Numeric. Minimum proportion of non-empty values that must parse as numeric for the column to be classified as "numeric". Defaults to 0.90. Configurable via type_inference_threshold in rule_overrides.

Value

A single character string: "date", "numeric", "character", or "unknown".

Examples

infer_col_type(c("2024-01-01", "2024-06-15"))   # "date"
#> [1] "date"
infer_col_type(c("1.5", "2.0", "3.1"))          # "numeric"
#> [1] "numeric"
infer_col_type(c("high", "low", "medium"))       # "character"
#> [1] "character"
infer_col_type(c(NA, "", NA))                    # "unknown"
#> [1] "unknown"
infer_col_type(c(rep("1", 17), "a", "b", "c"), threshold = 0.80)  # "numeric"
#> [1] "numeric"