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Adding predicate to protocol and metadata log replay query #336

Merged
merged 13 commits into from
Sep 18, 2024
Merged

Adding predicate to protocol and metadata log replay query #336

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dfdd756
Pass predicate in snapshot replay to filter metadata or protocol
OussamaSaoudi-db Sep 13, 2024
cf95385
Add clarifying comment for filter, rename filter variable
OussamaSaoudi-db Sep 13, 2024
0dc7fb2
Fix column names for filter
OussamaSaoudi-db Sep 13, 2024
c31a716
Change unary() call to just use not()
OussamaSaoudi-db Sep 13, 2024
59c4988
Use Expr associated type instead of Expression
OussamaSaoudi-db Sep 16, 2024
a9b2375
Validate that predicate is correctly passed to engine
OussamaSaoudi-db Sep 17, 2024
2d763b5
Amend acceptance tests
OussamaSaoudi-db Sep 17, 2024
911437e
Move print test to non-acceptance test
OussamaSaoudi-db Sep 17, 2024
fe77903
Remove unnecessary change
OussamaSaoudi-db Sep 17, 2024
49889e7
Address PR comments
OussamaSaoudi-db Sep 17, 2024
e461695
Remove unecessary changes in default engine
OussamaSaoudi-db Sep 17, 2024
7868f58
Remove unused imports
OussamaSaoudi-db Sep 17, 2024
beb9850
Move to tracing_subscriber
OussamaSaoudi-db Sep 17, 2024
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13 changes: 11 additions & 2 deletions kernel/src/snapshot.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
//!

use std::cmp::Ordering;
use std::ops::Not;
use std::sync::Arc;

use itertools::Itertools;
Expand Down Expand Up @@ -71,9 +72,17 @@ impl LogSegment {

fn read_metadata(&self, engine: &dyn Engine) -> DeltaResult<Option<(Metadata, Protocol)>> {
let schema = get_log_schema().project(&[PROTOCOL_NAME, METADATA_NAME])?;
// filter out log files that do not contain metadata or protocol information
let filter = Some(Expression::or(
Expression::not(Expression::is_null(Expression::Column(
"metaData.id".into(),
))),
Expression::not(Expression::is_null(Expression::Column(
"protocol.min_reader_version".into(),
))),
));
// read the same protocol and metadata schema for both commits and checkpoints
// TODO add metadata.table_id is not null and protocol.something_required is not null
let data_batches = self.replay(engine, schema.clone(), schema, None)?;
let data_batches = self.replay(engine, schema.clone(), schema, filter)?;
let mut metadata_opt: Option<Metadata> = None;
let mut protocol_opt: Option<Protocol> = None;
for batch in data_batches {
Expand Down
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