Module detect 

Codec auto-detection from column type and data distribution.

Analyzes up to the first 1024 values of a column to select the optimal codec chain. Called at flush time when ColumnCodec::Auto is configured.

Selection strategy:

• Partitions ≥ 1024 values → cascading codecs (ALP, FastLanes, etc.)
• Partitions < 1024 values → single-step codecs (Gorilla, Delta, etc.)
• f64 with >95% ALP encodability → AlpFastLanesLz4
• f64 with ≤95% ALP encodability → Gorilla (fallback)
• i64 timestamps/counters → DeltaFastLanesLz4
• Symbol columns → FastLanesLz4 (small integer IDs)

Functions

detect_codec

Detect the optimal codec for a column based on its type and data.

detect_f64_codec

Detect the optimal codec for an f64 column by analyzing the data.

detect_i64_codec

Detect the optimal codec for an i64 column by analyzing the data.