feat: support between sql clauses

python/python/tests/test_filter.py

@@ -81,6 +81,7 @@ def test_sql_predicates(dataset):
         ("int >= 50", 50),
         ("int = 50", 1),
         ("int != 50", 99),
+        ("int BETWEEN 50 AND 60", 11),
         ("float < 30.0", 45),
         ("str = 'aa'", 16),
         ("str in ('aa', 'bb')", 26),

python/python/tests/test_scalar_index.py

@@ -86,6 +86,25 @@ def test_indexed_scalar_scan(indexed_dataset: lance.LanceDataset, data_table: pa
         assert actual_price == expected_price
 
 
+def test_indexed_between(tmp_path):
+    dataset = lance.write_dataset(pa.table({"val": range(100)}), tmp_path)
+    dataset.create_scalar_index("val", index_type="BTREE")
+
+    scanner = dataset.scanner(filter="val BETWEEN 10 AND 20", prefilter=True)
+
+    assert "MaterializeIndex" in scanner.explain_plan()
+
+    actual_data = scanner.to_table()
+    assert actual_data.num_rows == 11
+
+    scanner = dataset.scanner(filter="val >= 10 AND val <= 20", prefilter=True)
+
+    assert "MaterializeIndex" in scanner.explain_plan()
+
+    actual_data = scanner.to_table()
+    assert actual_data.num_rows == 11
+
+
 def test_temporal_index(tmp_path):
     # Timestamps
     now = datetime.now()

rust/lance-datafusion/src/planner.rs

@@ -40,7 +40,7 @@ use datafusion::sql::sqlparser::ast::{
 };
 use datafusion::{
     common::Column,
-    logical_expr::{col, BinaryExpr, Like, Operator},
+    logical_expr::{col, Between, BinaryExpr, Like, Operator},
     physical_expr::execution_props::ExecutionProps,
     physical_plan::PhysicalExpr,
     prelude::Expr,
@@ -746,6 +746,25 @@ impl Planner {
                 let field_access_expr = RawFieldAccessExpr { expr, field_access };
                 self.plan_field_access(field_access_expr)
             }
+            SQLExpr::Between {
+                expr,
+                negated,
+                low,
+                high,
+            } => {
+                // Parse the main expression and bounds
+                let expr = self.parse_sql_expr(expr)?;
+                let low = self.parse_sql_expr(low)?;
+                let high = self.parse_sql_expr(high)?;
+
+                let between = Expr::Between(Between::new(
+                    Box::new(expr),
+                    *negated,
+                    Box::new(low),
+                    Box::new(high),
+                ));
+                Ok(between)
+            }
             _ => Err(Error::invalid_input(
                 format!("Expression '{expr}' is not supported SQL in lance"),
                 location!(),
@@ -1463,6 +1482,98 @@ mod tests {
         }
     }
 
+    #[test]
+    fn test_sql_between() {
+        use arrow_array::{Float64Array, Int32Array, TimestampMicrosecondArray};
+        use arrow_schema::{DataType, Field, Schema, TimeUnit};
+        use std::sync::Arc;
+
+        let schema = Arc::new(Schema::new(vec![
+            Field::new("x", DataType::Int32, false),
+            Field::new("y", DataType::Float64, false),
+            Field::new(
+                "ts",
+                DataType::Timestamp(TimeUnit::Microsecond, None),
+                false,
+            ),
+        ]));
+
+        let planner = Planner::new(schema.clone());
+
+        // Test integer BETWEEN
+        let expr = planner
+            .parse_filter("x BETWEEN CAST(3 AS INT) AND CAST(7 AS INT)")
+            .unwrap();
+        let physical_expr = planner.create_physical_expr(&expr).unwrap();
+
+        // Create timestamp array with values representing:
+        // 2024-01-01 00:00:00 to 2024-01-01 00:00:09 (in microseconds)
+        let base_ts = 1704067200000000_i64; // 2024-01-01 00:00:00
+        let ts_array = TimestampMicrosecondArray::from_iter_values(
+            (0..10).map(|i| base_ts + i * 1_000_000), // Each value is 1 second apart
+        );
+
+        let batch = RecordBatch::try_new(
+            schema,
+            vec![
+                Arc::new(Int32Array::from_iter_values(0..10)) as ArrayRef,
+                Arc::new(Float64Array::from_iter_values((0..10).map(|v| v as f64))),
+                Arc::new(ts_array),
+            ],
+        )
+        .unwrap();
+
+        let predicates = physical_expr.evaluate(&batch).unwrap();
+        assert_eq!(
+            predicates.into_array(0).unwrap().as_ref(),
+            &BooleanArray::from(vec![
+                false, false, false, true, true, true, true, true, false, false
+            ])
+        );
+
+        // Test NOT BETWEEN
+        let expr = planner
+            .parse_filter("x NOT BETWEEN CAST(3 AS INT) AND CAST(7 AS INT)")
+            .unwrap();
+        let physical_expr = planner.create_physical_expr(&expr).unwrap();
+
+        let predicates = physical_expr.evaluate(&batch).unwrap();
+        assert_eq!(
+            predicates.into_array(0).unwrap().as_ref(),
+            &BooleanArray::from(vec![
+                true, true, true, false, false, false, false, false, true, true
+            ])
+        );
+
+        // Test floating point BETWEEN
+        let expr = planner.parse_filter("y BETWEEN 2.5 AND 6.5").unwrap();
+        let physical_expr = planner.create_physical_expr(&expr).unwrap();
+
+        let predicates = physical_expr.evaluate(&batch).unwrap();
+        assert_eq!(
+            predicates.into_array(0).unwrap().as_ref(),
+            &BooleanArray::from(vec![
+                false, false, false, true, true, true, true, false, false, false
+            ])
+        );
+
+        // Test timestamp BETWEEN
+        let expr = planner
+            .parse_filter(
+                "ts BETWEEN timestamp '2024-01-01 00:00:03' AND timestamp '2024-01-01 00:00:07'",
+            )
+            .unwrap();
+        let physical_expr = planner.create_physical_expr(&expr).unwrap();
+
+        let predicates = physical_expr.evaluate(&batch).unwrap();
+        assert_eq!(
+            predicates.into_array(0).unwrap().as_ref(),
+            &BooleanArray::from(vec![
+                false, false, false, true, true, true, true, true, false, false
+            ])
+        );
+    }
+
     #[test]
     fn test_sql_comparison() {
         // Create a batch with all data types

rust/lance-index/src/scalar/expression.rs

@@ -16,6 +16,7 @@ use datafusion_expr::{
 use futures::join;
 use lance_core::{utils::mask::RowIdMask, Result};
 use lance_datafusion::{expr::safe_coerce_scalar, planner::Planner};
+use log::warn;
 use tracing::instrument;
 
 use super::{AnyQuery, LabelListQuery, SargableQuery, ScalarIndex};
@@ -564,16 +565,85 @@ fn visit_comparison(
         let scalar = maybe_scalar(&expr.right, col_type)?;
         query_parser.visit_comparison(column, scalar, &expr.op)
     } else {
-        let (column, col_type, query_parser) = maybe_indexed_column(&expr.right, index_info)?;
-        let scalar = maybe_scalar(&expr.left, col_type)?;
-        query_parser.visit_comparison(column, scalar, &expr.op)
+        // Datafusion's query simplifier will canonicalize expressions and so we shouldn't reach this case.  If, for some reason, we
+        // do reach this case we can handle it in the future by inverting expr.op and swapping the left and right sides
+        warn!("Unexpected comparison encountered (DF simplifier should have removed this case).  Scalar indices will not be applied");
+        None
+    }
+}
+
+fn maybe_between(expr: &BinaryExpr) -> Option<Between> {
+    let left_comparison = match expr.left.as_ref() {
+        Expr::BinaryExpr(binary_expr) => Some(binary_expr),
+        _ => None,
+    }?;
+    let right_comparison = match expr.right.as_ref() {
+        Expr::BinaryExpr(binary_expr) => Some(binary_expr),
+        _ => None,
+    }?;
+
+    match (left_comparison.op, right_comparison.op) {
+        (Operator::GtEq, Operator::LtEq) => {
+            // We have x >= y && a <= b.
+            // If x == a then it is a between query
+            // if y == b then it is a between query
+            if left_comparison.left == right_comparison.left {
+                Some(Between {
+                    expr: left_comparison.left.clone(),
+                    low: left_comparison.right.clone(),
+                    high: right_comparison.right.clone(),
+                    negated: false,
+                })
+            } else if left_comparison.right == right_comparison.right {
+                Some(Between {
+                    expr: left_comparison.right.clone(),
+                    low: right_comparison.left.clone(),
+                    high: left_comparison.left.clone(),
+                    negated: false,
+                })
+            } else {
+                None
+            }
+        }
+        (Operator::LtEq, Operator::GtEq) => {
+            // Same logic as above we just switch the low/high
+            if left_comparison.left == right_comparison.left {
+                Some(Between {
+                    expr: left_comparison.left.clone(),
+                    low: right_comparison.right.clone(),
+                    high: left_comparison.right.clone(),
+                    negated: false,
+                })
+            } else if left_comparison.right == right_comparison.right {
+                Some(Between {
+                    expr: left_comparison.right.clone(),
+                    low: left_comparison.left.clone(),
+                    high: right_comparison.left.clone(),
+                    negated: false,
+                })
+            } else {
+                None
+            }
+        }
+        _ => None,
     }
 }
 
 fn visit_and(
     expr: &BinaryExpr,
     index_info: &dyn IndexInformationProvider,
 ) -> Option<IndexedExpression> {
+    // Many scalar indices can efficiently handle a BETWEEN query as a single search and this
+    // can be much more efficient than two separate range queries.  As an optimization we check
+    // to see if this is a between query and, if so, we handle it as a single query
+    //
+    // Note: We can't rely on users writing the SQL BETWEEN operator because:
+    //   * Some users won't realize it's an option or a good idea
+    //   * Datafusion's simplifier will rewrite the BETWEEN operator into two separate range queries
+    if let Some(between) = maybe_between(expr) {
+        return visit_between(&between, index_info);
+    }
+
     let left = visit_node(&expr.left, index_info);
     let right = visit_node(&expr.right, index_info);
     match (left, right) {
@@ -912,6 +982,7 @@ mod tests {
         ]);
 
         check_no_index(&index_info, "size BETWEEN 5 AND 10");
+        // 5 different ways of writing BETWEEN (all should be recognized)
         check_simple(
             &index_info,
             "aisle BETWEEN 5 AND 10",
@@ -921,6 +992,45 @@ mod tests {
                 Bound::Included(ScalarValue::UInt32(Some(10))),
             ),
         );
+        check_simple(
+            &index_info,
+            "aisle >= 5 AND aisle <= 10",
+            "aisle",
+            SargableQuery::Range(
+                Bound::Included(ScalarValue::UInt32(Some(5))),
+                Bound::Included(ScalarValue::UInt32(Some(10))),
+            ),
+        );
+
+        check_simple(
+            &index_info,
+            "aisle <= 10 AND aisle >= 5",
+            "aisle",
+            SargableQuery::Range(
+                Bound::Included(ScalarValue::UInt32(Some(5))),
+                Bound::Included(ScalarValue::UInt32(Some(10))),
+            ),
+        );
+
+        check_simple(
+            &index_info,
+            "5 <= aisle AND 10 >= aisle",
+            "aisle",
+            SargableQuery::Range(
+                Bound::Included(ScalarValue::UInt32(Some(5))),
+                Bound::Included(ScalarValue::UInt32(Some(10))),
+            ),
+        );
+
+        check_simple(
+            &index_info,
+            "10 >= aisle AND 5 <= aisle",
+            "aisle",
+            SargableQuery::Range(
+                Bound::Included(ScalarValue::UInt32(Some(5))),
+                Bound::Included(ScalarValue::UInt32(Some(10))),
+            ),
+        );
         check_simple(
             &index_info,
             "on_sale IS TRUE",
@@ -1023,6 +1133,10 @@ mod tests {
                 Bound::Unbounded,
             ),
         );
+        // In the future we can handle this case if we need to.  For
+        // now let's make sure we don't accidentally do the wrong thing
+        // (we were getting this backwards in the past)
+        check_no_index(&index_info, "10 > aisle");
         check_simple(
             &index_info,
             "aisle >= 10",