nodedb 0.0.0-beta.1

Local-first, real-time, edge-to-cloud hybrid database for multi-modal workloads
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133

//! Index-backed range scan extraction from WHERE predicates.

use datafusion::logical_expr::{BinaryExpr, Operator};
use datafusion::prelude::*;

use crate::bridge::envelope::PhysicalPlan;
use crate::bridge::physical_plan::DocumentOp;
use crate::control::planner::physical::PhysicalTask;
use crate::types::{TenantId, VShardId};

/// Try to convert a predicate on a non-id field into an index-backed RangeScan.
///
/// Supports:
/// - Equality: `WHERE field = value` → exact range `[value, value\0)`
/// - Range: `WHERE field > lower AND field < upper` → range `(lower, upper)`
/// - Single-bound: `WHERE field >= value` → range `[value, ...)`
pub(in crate::control::planner) fn try_range_scan_from_predicate(
    collection: &str,
    predicate: &Expr,
    tenant_id: TenantId,
    vshard: VShardId,
) -> Option<PhysicalTask> {
    match predicate {
        // Simple equality: field = value
        Expr::BinaryExpr(binary) if binary.op == Operator::Eq => {
            let (col_name, value) = extract_col_literal(binary)?;
            if col_name == "id" || col_name == "document_id" {
                return None;
            }
            let value_clean = value.trim_matches('\'').trim_matches('"').to_string();
            Some(PhysicalTask {
                tenant_id,
                vshard_id: vshard,
                plan: PhysicalPlan::Document(DocumentOp::RangeScan {
                    collection: collection.to_string(),
                    field: col_name.to_string(),
                    lower: Some(value_clean.as_bytes().to_vec()),
                    upper: Some(format!("{value_clean}\x00").as_bytes().to_vec()),
                    limit: 1000,
                }),
            })
        }

        // Range predicates on single field: GT, GTE, LT, LTE
        Expr::BinaryExpr(binary)
            if matches!(
                binary.op,
                Operator::Gt | Operator::GtEq | Operator::Lt | Operator::LtEq
            ) =>
        {
            let (col_name, value) = extract_col_literal(binary)?;
            if col_name == "id" || col_name == "document_id" {
                return None;
            }
            let value_clean = value.trim_matches('\'').trim_matches('"').to_string();
            let value_bytes = value_clean.as_bytes().to_vec();

            let (lower, upper) = match binary.op {
                Operator::Gt => (Some(format!("{value_clean}\x00").as_bytes().to_vec()), None),
                Operator::GtEq => (Some(value_bytes), None),
                Operator::Lt => (None, Some(value_bytes)),
                Operator::LtEq => (None, Some(format!("{value_clean}\x00").as_bytes().to_vec())),
                _ => return None,
            };

            Some(PhysicalTask {
                tenant_id,
                vshard_id: vshard,
                plan: PhysicalPlan::Document(DocumentOp::RangeScan {
                    collection: collection.to_string(),
                    field: col_name.to_string(),
                    lower,
                    upper,
                    limit: 1000,
                }),
            })
        }

        // AND of two range predicates on the same field
        Expr::BinaryExpr(binary) if binary.op == Operator::And => {
            let left_scan =
                try_range_scan_from_predicate(collection, &binary.left, tenant_id, vshard)?;
            let right_scan =
                try_range_scan_from_predicate(collection, &binary.right, tenant_id, vshard)?;

            if let (
                PhysicalPlan::Document(DocumentOp::RangeScan {
                    field: f1,
                    lower: l1,
                    upper: u1,
                    ..
                }),
                PhysicalPlan::Document(DocumentOp::RangeScan {
                    field: f2,
                    lower: l2,
                    upper: u2,
                    ..
                }),
            ) = (&left_scan.plan, &right_scan.plan)
                && f1 == f2
            {
                let merged_lower = l1.clone().or_else(|| l2.clone());
                let merged_upper = u1.clone().or_else(|| u2.clone());
                return Some(PhysicalTask {
                    tenant_id,
                    vshard_id: vshard,
                    plan: PhysicalPlan::Document(DocumentOp::RangeScan {
                        collection: collection.to_string(),
                        field: f1.clone(),
                        lower: merged_lower,
                        upper: merged_upper,
                        limit: 1000,
                    }),
                });
            }
            None
        }

        _ => None,
    }
}

/// Extract (column_name, literal_value_string) from a binary expression
/// where one side is a Column and the other is a Literal.
pub(in crate::control::planner) fn extract_col_literal(
    binary: &BinaryExpr,
) -> Option<(String, String)> {
    match (&*binary.left, &*binary.right) {
        (Expr::Column(col), Expr::Literal(lit, _)) => Some((col.name.clone(), lit.to_string())),
        (Expr::Literal(lit, _), Expr::Column(col)) => Some((col.name.clone(), lit.to_string())),
        _ => None,
    }
}