spg-engine 7.37.16

Execution engine for SPG: glues spg-sql parsing to spg-storage. Foreign keys, joins, vectors, cold tier.
Documentation 
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//! v7.37.17 (17.6 siblings) — array_upper / array_lower /
//! array_ndims / array_dims.

use spg_engine::{Engine, QueryResult};

fn first(e: &mut Engine, sql: &str) -> spg_storage::Value<'static> {
    let r = e
        .execute(sql)
        .unwrap_or_else(|err| panic!("{sql}: {err:?}"));
    let QueryResult::Rows { rows, .. } = r else {
        panic!("expected Rows");
    };
    rows[0].values[0].clone()
}

#[test]
fn array_upper_lower_1d() {
    let mut e = Engine::new();
    match first(&mut e, "SELECT array_lower(ARRAY[10, 20, 30], 1)") {
        spg_storage::Value::Int(1) => {}
        other => panic!("got {other:?}"),
    }
    match first(&mut e, "SELECT array_upper(ARRAY[10, 20, 30], 1)") {
        spg_storage::Value::Int(3) => {}
        other => panic!("got {other:?}"),
    }
}

#[test]
fn array_upper_lower_null_for_other_dims() {
    let mut e = Engine::new();
    // SPG models 1-D arrays only; dim=2 → NULL.
    assert!(matches!(
        first(&mut e, "SELECT array_upper(ARRAY[1, 2, 3], 2)"),
        spg_storage::Value::Null
    ));
    assert!(matches!(
        first(&mut e, "SELECT array_lower(ARRAY[1, 2, 3], 2)"),
        spg_storage::Value::Null
    ));
}

#[test]
fn array_ndims_returns_1_for_non_empty() {
    let mut e = Engine::new();
    match first(&mut e, "SELECT array_ndims(ARRAY[1, 2, 3])") {
        spg_storage::Value::Int(1) => {}
        other => panic!("got {other:?}"),
    }
    match first(&mut e, "SELECT array_ndims(ARRAY['a', 'b'])") {
        spg_storage::Value::Int(1) => {}
        other => panic!("got {other:?}"),
    }
}

#[test]
fn array_dims_returns_bracket_range() {
    let mut e = Engine::new();
    match first(&mut e, "SELECT array_dims(ARRAY[1, 2, 3, 4, 5])") {
        spg_storage::Value::Text(s) => assert_eq!(s.as_ref(), "[1:5]"),
        other => panic!("got {other:?}"),
    }
    match first(&mut e, "SELECT array_dims(ARRAY['x'])") {
        spg_storage::Value::Text(s) => assert_eq!(s.as_ref(), "[1:1]"),
        other => panic!("got {other:?}"),
    }
}

/// U18 (read01 A-group): the dimension/length array functions
/// (array_length / array_upper / array_lower / array_ndims /
/// array_dims / cardinality) are element-type-agnostic in PG, but
/// SPG only matched Text/Int/BigInt arms and errored on every other
/// element type (bool[], date[], numeric[], float8[], ...). Values
/// asserted against live PG 18.4.
#[test]
fn dimension_funcs_cover_all_element_types() {
    let mut e = Engine::new();
    let i = |e: &mut Engine, sql: &str| match first(e, sql) {
        spg_storage::Value::Int(n) => n,
        other => panic!("{sql}: got {other:?}"),
    };
    // bool[]
    assert_eq!(i(&mut e, "SELECT array_length(ARRAY[true,false], 1)"), 2);
    assert_eq!(i(&mut e, "SELECT cardinality(ARRAY[true,false,true])"), 3);
    assert_eq!(i(&mut e, "SELECT array_ndims(ARRAY[true,false])"), 1);
    // date[]
    assert_eq!(
        i(
            &mut e,
            "SELECT array_upper(ARRAY['2024-01-01'::date,'2024-01-02'], 1)"
        ),
        2
    );
    // numeric[] / float8[]
    assert_eq!(
        i(&mut e, "SELECT array_lower(ARRAY[1.5,2.5]::numeric[], 1)"),
        1
    );
    assert_eq!(
        i(
            &mut e,
            "SELECT array_upper(ARRAY[1.5,2.5,3.5]::float8[], 1)"
        ),
        3
    );
    assert_eq!(
        i(&mut e, "SELECT array_ndims(ARRAY[1.5,2.5]::numeric[])"),
        1
    );
    // array_dims on bool[]
    match first(&mut e, "SELECT array_dims(ARRAY[true,false,true])") {
        spg_storage::Value::Text(s) => assert_eq!(s.as_ref(), "[1:3]"),
        other => panic!("got {other:?}"),
    }
    // Empty typed array → NULL length/ndims (PG: no dimensions).
    assert!(matches!(
        first(&mut e, "SELECT array_length(ARRAY[]::bool[], 1)"),
        spg_storage::Value::Null
    ));
}

#[test]
fn array_out_quotes_whitespace_elements() {
    // PG array_out quotes an element containing newline / carriage-return /
    // form-feed (array_isspace), not just space/tab. Live-PG18.4-verified.
    let mut e = Engine::new();
    let txt = |e: &mut Engine, sql: &str| -> String {
        match first(e, sql) {
            spg_storage::Value::Text(s) => s.to_string(),
            o => panic!("{sql}: {o:?}"),
        }
    };
    assert_eq!(txt(&mut e, "SELECT (ARRAY[E'a\\nb'])::text"), "{\"a\nb\"}");
    assert_eq!(txt(&mut e, "SELECT (ARRAY[E'a\\rb'])::text"), "{\"a\rb\"}");
    assert_eq!(
        txt(&mut e, "SELECT (ARRAY[E'a\\fb'])::text"),
        "{\"a\u{c}b\"}"
    );
    // Tab still quotes (regression guard) and a plain element does not.
    assert_eq!(txt(&mut e, "SELECT (ARRAY[E'a\\tb'])::text"), "{\"a\tb\"}");
    assert_eq!(txt(&mut e, "SELECT (ARRAY['ab'])::text"), "{ab}");
}