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carpecodeumcarpecodeum
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[ADD] add hybrid approach for field access
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8 files changed

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-572
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8 files changed

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‎parquet-variant-compute/examples/field_removal.rs

Lines changed: 116 additions & 0 deletions
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use arrow::array::Array;
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use parquet_variant_compute::VariantArrayBuilder;
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use parquet_variant::VariantBuilder;
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fn main() {
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// Create some sample data with fields to remove
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let mut builder = VariantArrayBuilder::new(2);
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// Row 1: User with temporary data
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{
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let mut variant_builder = VariantBuilder::new();
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{
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let mut obj = variant_builder.new_object();
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obj.insert("name", "Alice");
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obj.insert("age", 30i32);
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obj.insert("temp_session", "abc123");
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obj.insert("debug_info", "temporary debug data");
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{
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let mut address = obj.new_object("address");
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address.insert("city", "New York");
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address.insert("zip", "10001");
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address.insert("temp_geocode", "40.7128,-74.0060");
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let _ = address.finish();
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}
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let _ = obj.finish();
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}
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let (metadata, value) = variant_builder.finish();
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builder.append_variant_buffers(&metadata, &value);
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}
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// Row 2: Another user with temporary data
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{
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let mut variant_builder = VariantBuilder::new();
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{
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let mut obj = variant_builder.new_object();
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obj.insert("name", "Bob");
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obj.insert("age", 25i32);
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obj.insert("temp_session", "def456");
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obj.insert("debug_info", "more temporary data");
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{
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let mut address = obj.new_object("address");
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address.insert("city", "San Francisco");
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address.insert("zip", "94102");
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address.insert("temp_geocode", "37.7749,-122.4194");
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let _ = address.finish();
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}
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let _ = obj.finish();
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}
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let (metadata, value) = variant_builder.finish();
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builder.append_variant_buffers(&metadata, &value);
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}
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let array = builder.finish();
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println!("=== Field Removal Examples ===");
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// Show original data
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println!("Original data:");
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for i in 0..array.len() {
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let variant = array.value(i);
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if let Some(obj) = variant.as_object() {
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let name = obj.get("name").unwrap().as_string().unwrap().to_string();
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let session = obj.get("temp_session").map(|v| v.as_string().unwrap().to_string()).unwrap_or("None".to_string());
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let debug = obj.get("debug_info").map(|v| v.as_string().unwrap().to_string()).unwrap_or("None".to_string());
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println!(" {}: session={}, debug={}", name, session, debug);
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}
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}
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// Remove temporary session field
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let cleaned_array = array.with_field_removed("temp_session").unwrap();
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println!("\nRemoving temporary session fields...");
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println!("After removing temp_session:");
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for i in 0..cleaned_array.len() {
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let variant = cleaned_array.value(i);
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if let Some(obj) = variant.as_object() {
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let name = obj.get("name").unwrap().as_string().unwrap().to_string();
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let session = obj.get("temp_session").map(|v| v.as_string().unwrap().to_string()).unwrap_or("None".to_string());
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let debug = obj.get("debug_info").map(|v| v.as_string().unwrap().to_string()).unwrap_or("None".to_string());
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println!(" {}: session={}, debug={}", name, session, debug);
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}
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}
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// Remove multiple temporary fields
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let final_array = cleaned_array.with_fields_removed(&["debug_info", "temp_session"]).unwrap();
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println!("\nRemoving multiple temporary fields...");
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println!("Final clean data:");
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for i in 0..final_array.len() {
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let variant = final_array.value(i);
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if let Some(obj) = variant.as_object() {
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let name = obj.get("name").unwrap().as_string().unwrap().to_string();
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let age = obj.get("age").unwrap().as_int32().unwrap();
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if let Some(address) = obj.get("address") {
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if let Some(addr_obj) = address.as_object() {
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let city = addr_obj.get("city").unwrap().as_string().unwrap().to_string();
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let zip = addr_obj.get("zip").unwrap().as_string().unwrap().to_string();
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let geocode = addr_obj.get("temp_geocode").map(|v| format!("Some(ShortString(ShortString(\"{}\")))", v.as_string().unwrap())).unwrap_or("None".to_string());
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println!(" {}: age={}, city={}, zip={}, geocode={}", name, age, city, zip, geocode);
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}
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}
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}
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}
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println!("\n=== Performance Features ===");
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println!("✓ Efficient field removal at byte level");
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println!("✓ Support for nested field removal");
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println!("✓ Batch operations for cleaning multiple fields");
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println!("✓ Maintains data integrity during field removal");
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println!("✓ Foundation for data governance and privacy compliance");
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}

‎parquet-variant-compute/examples/path_access.rs

Lines changed: 21 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -62,7 +62,7 @@ fn main() {
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builder.append_variant_buffers(&metadata, &value);
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}
6464

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let variant_array = builder.build();
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let variant_array = builder.finish();
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// Demonstrate path access functionality
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println!("=== Path Access Examples ===");
@@ -72,7 +72,7 @@ fn main() {
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let alice_name = variant_array.get_path(0, &name_path).unwrap();
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println!("Alice's name: {}", alice_name.as_string().unwrap());
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// 2. Nested field access
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// 2. Nested field access
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let city_path = VariantPath::field("address").push_field("city");
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let alice_city = variant_array.get_path(0, &city_path).unwrap();
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let bob_city = variant_array.get_path(1, &city_path).unwrap();
@@ -92,19 +92,25 @@ fn main() {
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VariantPath::field("age"),
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VariantPath::field("address").push_field("city"),
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];
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let alice_data = variant_array.get_paths(0, &paths);
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println!("Alice's data: name={}, age={}, city={}",
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alice_data[0].as_ref().unwrap().as_string().unwrap(),
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alice_data[1].as_ref().unwrap().as_int32().unwrap(),
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alice_data[2].as_ref().unwrap().as_string().unwrap());
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// 5. Column-wise extraction
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let names = variant_array.extract_field(&VariantPath::field("name"));
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println!("All names: {:?}", names.iter().map(|v| v.as_ref().unwrap().as_string().unwrap()).collect::<Vec<_>>());
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print!("Alice's data: ");
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for (i, path_result) in alice_data.iter().enumerate() {
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if let Some(variant) = path_result {
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if i == 0 {
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print!("name={}", variant.as_string().unwrap());
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} else if i == 1 {
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print!(", age={}", variant.as_int32().unwrap());
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} else if i == 2 {
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print!(", city={}", variant.as_string().unwrap());
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}
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}
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}
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println!();
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println!("=== Performance Benefit ===");
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println!("✓ Direct field access without reconstructing entire variants");
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println!("✓ Efficient batch operations for analytical workloads");
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println!("✓ Foundation for shredding/unshredding operations");
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// 5. Batch field extraction
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let all_names = variant_array.extract_field_by_path(&VariantPath::field("name"));
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let name_strings: Vec<String> = all_names.iter()
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.filter_map(|opt| opt.as_ref().map(|v| v.as_string().unwrap().to_string()))
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.collect();
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println!("All names: {:?}", name_strings);
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}

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