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//! # Table Optimization
//!
//! This module provides tools for optimizing table layout, such as compacting small files
//! (bin-packing) and sorting data (Z-Ordering).
use crate::table::Table;
use crate::transaction::Transaction;
use anyhow::Result;
/// Options for compaction.
#[derive(Debug, Clone)]
pub struct CompactOptions {
/// Target file size in bytes (e.g., 128MB).
pub target_size_bytes: u64,
/// Minimum number of files to trigger compaction.
pub min_files_to_compact: usize,
/// Filter for compaction
pub filter: Option<String>,
}
impl Default for CompactOptions {
fn default() -> Self {
Self {
target_size_bytes: 128 * 1024 * 1024,
min_files_to_compact: 5,
filter: None,
}
}
}
/// Scheduler for running compaction tasks.
pub struct CompactionScheduler {
// Placeholder for scheduler state
}
impl CompactionScheduler {
pub fn new() -> Self {
Self {}
}
pub async fn schedule_compaction(&self, _table: &Table) -> Result<()> {
// Placeholder
Ok(())
}
}
/// Strategy for compaction.
#[derive(Debug, Clone)]
pub enum CompactionStrategy {
/// Combines small files into larger ones.
BinPack,
/// Sorts data by specific columns (e.g., Z-Order).
Sort {
/// Columns to sort by.
sort_columns: Vec<String>,
},
}
/// Main optimizer entry point.
pub struct Optimizer {
table: Table,
options: CompactOptions,
strategy: CompactionStrategy,
}
impl Optimizer {
pub fn new(table: Table) -> Self {
Self {
table,
options: CompactOptions::default(),
strategy: CompactionStrategy::BinPack,
}
}
/// Sets the compaction options.
pub fn with_options(mut self, options: CompactOptions) -> Self {
self.options = options;
self
}
/// Sets the compaction strategy.
pub fn with_strategy(mut self, strategy: CompactionStrategy) -> Self {
self.strategy = strategy;
self
}
/// Executes the optimization.
pub async fn execute(self) -> Result<Transaction> {
let snapshot = self.table.metadata.current_snapshot();
if snapshot.is_none() {
return Ok(self.table.new_transaction());
}
let snapshot = snapshot.unwrap();
let all_files = snapshot.all_data_files(&self.table.storage).await?;
// Filter files based on self.filter (Placeholder)
// Identify small files
let mut files_to_compact = Vec::new();
// let mut other_files = Vec::new();
let target_size = self.options.target_size_bytes;
for file in all_files {
if (file.file_size_in_bytes as u64) < target_size {
files_to_compact.push(file);
} else {
// other_files.push(file);
}
}
if files_to_compact.len() < self.options.min_files_to_compact {
return Ok(self.table.new_transaction());
}
// Implementation limitation:
// Real compaction requires reading these files, merging them, and writing new ones.
// For this prototype, we will just return a transaction that *would* replace them,
// but since we can't easily read/write locally without full context, we'll
// leave it as a placeholder that does no-op but compiles.
// In a real implementation:
// 1. Group files into bins of target_size
// 2. Read each bin -> RecordBatch
// 3. Write RecordBatch -> New DataFile
// 4. Create Transaction: Remove old files, Add new files
let tx = self.table.new_transaction();
// tx.remove_files(files_to_compact.iter().map(|f| f.file_path.clone()).collect());
// tx.add_files(new_files);
Ok(tx)
}
}