semantic-ds-toolkit/dist/src/drift/pattern-drift.d.ts

Performance-first semantic layer for modern data stacks - Stable Column Anchors & intelligent inference

import { ColumnFingerprint } from '../types/anchor.types';
import { DriftType } from './drift-detector';
export interface PatternDriftAnalysis {
    similarity_score: number;
    new_patterns: PatternInfo[];
    lost_patterns: PatternInfo[];
    changed_patterns: PatternChange[];
    format_stability: 'stable' | 'minor_change' | 'major_change' | 'format_shift';
    sample_analysis: SampleDriftAnalysis;
}
export interface PatternInfo {
    pattern: string;
    frequency: number;
    confidence: number;
    examples: string[];
    semantic_type?: string;
}
export interface PatternChange {
    old_pattern: string;
    new_pattern: string;
    similarity: number;
    impact_severity: 'low' | 'medium' | 'high';
    transformation_type: 'format_evolution' | 'encoding_change' | 'scale_change' | 'semantic_drift';
}
export interface SampleDriftAnalysis {
    format_consistency: number;
    length_distribution_change: number;
    character_set_changes: string[];
    structural_changes: StructuralChange[];
}
export interface StructuralChange {
    type: 'delimiter_change' | 'casing_change' | 'encoding_change' | 'prefix_suffix_change';
    description: string;
    impact: number;
    examples: {
        before: string;
        after: string;
    }[];
}
export declare class PatternDriftDetector {
    private readonly COMMON_PATTERNS;
    private readonly SEMANTIC_PATTERNS;
    detectPatternDrift(historicalFingerprint: ColumnFingerprint, currentFingerprint: ColumnFingerprint, similarityThreshold?: number): Promise<DriftType | null>;
    analyzePatternDrift(historicalFingerprint: ColumnFingerprint, currentFingerprint: ColumnFingerprint): Promise<PatternDriftAnalysis>;
    private extractPatterns;
    private analyzePattern;
    private detectPatternsFromSamples;
    private generateStructuralPatterns;
    private detectCharacterClassPatterns;
    private generateCharacterClassPattern;
    private matchesCharacterClass;
    private calculatePatternSimilarity;
    private findNewPatterns;
    private findLostPatterns;
    private findChangedPatterns;
    private analyzeSampleDrift;
    private calculateFormatConsistency;
    private calculateLengthDistributionChange;
    private detectCharacterSetChanges;
    private detectStructuralChanges;
    private detectDelimiterChanges;
    private detectCasingChanges;
    private detectAffixChanges;
    private deduplicatePatterns;
    private calculatePatternConfidence;
    private identifySemanticType;
    private assessFormatStability;
    private assessChangeImpact;
    private identifyTransformationType;
    private countDelimiters;
    private analyzeCasing;
    private extractCommonAffixes;
    private compareAffixes;
}
//# sourceMappingURL=pattern-drift.d.ts.map