Struct ColumnProfileInput 

pub struct ColumnProfileInput<'a> {

    pub name: String,
    pub data_type: DataType,
    pub total_count: usize,
    pub null_count: usize,
    pub unique_count: Option<usize>,
    pub unique_count_is_approximate: Option<bool>,
    pub sample_values: &'a [String],
    pub text_lengths: Option<TextLengths>,
    pub boolean_counts: Option<(usize, usize)>,
    pub skip_statistics: bool,
    pub skip_patterns: bool,
    pub locale: Option<&'a str>,
    pub exact_numeric: Option<ExactNumericAggregates>,
    pub exact_date_matches: Option<usize>,
}

Inputs that every engine can provide for centralized profile construction.

Fields

name: String

data_type: DataType

total_count: usize

null_count: usize

unique_count: Option<usize>

unique_count_is_approximate: Option<bool>

Whether unique_count is an approximate (HLL) estimate. None mirrors unique_count: None; Some(false) for exact counts; Some(true) once the engine’s cardinality estimator has spilled to its HLL sketch.

sample_values: &'a [String]

text_lengths: Option<TextLengths>

Pre-computed text lengths for engines that track them incrementally. When Some, text stats are built from these instead of re-scanning samples.

boolean_counts: Option<(usize, usize)>

Pre-computed boolean counts (true_count, false_count) for boolean columns.

skip_statistics: bool

When true, skip statistics computation (produce ColumnStats::None).

skip_patterns: bool

When true, skip pattern detection (produce patterns: None).

locale: Option<&'a str>

Optional locale for pattern detection (e.g. “IT”, “US”).

exact_numeric: Option<ExactNumericAggregates>

Exact aggregates over every numeric value the engine streamed.

When present, these override the sample-derived min, max, mean, std_dev, and variance on numeric columns, so those fields stay exact even when sample_values no longer covers the full stream. None means sample_values is the full data (in-memory sources) or the engine has no exact accumulators for the column.

exact_date_matches: Option<usize>

Number of values over the full stream accepted by the temporal parser. None means sample_values is the complete in-memory column.