hamelin_legacy 0.4.4

Legacy AST translation code for Hamelin (to be deprecated)
Documentation 
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use std::sync::Arc;

use hamelin_legacy::Compiler;
use hamelin_lib::{
    catalog::{CatalogBuilder, CatalogProvider, DataSetBuilder},
    types::{struct_type::Struct, INT, STRING},
};
use rstest::rstest;

use crate::shared;

fn compiler() -> Arc<Compiler> {
    let catalog = CatalogBuilder::default()
        .with_data_set(
            DataSetBuilder::new("table".into())
                .with("t1", INT)
                .with("t2", INT)
                .with("t3", STRING)
                .with(
                    "nested",
                    Struct::default()
                        .with("a".parse().unwrap(), INT)
                        .with("b".parse().unwrap(), STRING)
                        .with(
                            "c".parse().unwrap(),
                            Struct::default()
                                .with("d".parse().unwrap(), INT)
                                .with("e".parse().unwrap(), STRING)
                                .into(),
                        )
                        .into(),
                ),
        )
        .build();

    let mut compiler = Compiler::new();
    compiler.set_environment_provider(Arc::new(CatalogProvider::try_from(catalog).unwrap()));
    Arc::new(compiler)
}

#[rstest]
#[case::select_nested(
    "FROM table | SELECT nested.c.d",
    r#"
        SELECT
          CAST(
            ROW(ROW("nested"."c"."d")) AS ROW("c" ROW("d" BIGINT))
          ) AS "nested"
        FROM
            "table"
    "#
)]
#[case::select_two_nested(
    "FROM table | SELECT nested.b, nested.c.d",
    r#"
        SELECT
          CAST(
            ROW("nested"."b", ROW("nested"."c"."d")) AS ROW("b" VARCHAR, "c" ROW("d" BIGINT))
          ) AS "nested"
        FROM
            "table"
    "#
)]
#[case::drop_nested(
    "FROM table | DROP nested.c.d",
    r#"
        SELECT
            "t1"
            , "t2"
            , "t3"
            , CAST(
                ROW(
                    "nested"."a"
                    , "nested"."b"
                    , ROW("nested"."c"."e")
                )
                AS
                ROW(
                    "a" BIGINT
                    , "b" VARCHAR
                    , "c" ROW("e" VARCHAR)
                )
            ) AS "nested"
        FROM
            "table"
    "#
)]
#[case::let_nested(
    "FROM table | LET nested.b = 'new value'",
    r#"
        SELECT
            CAST(
                ROW(
                    "nested"."a"
                    , 'new value'
                    , ROW("nested"."c"."d", "nested"."c"."e")
                ) AS ROW("a" BIGINT, "b" VARCHAR, "c" ROW("d" BIGINT, "e" VARCHAR))
            ) AS "nested"
            , "t1"
            , "t2"
            , "t3"
        FROM
            "table"
    "#
)]
#[case::let_then_select_nested(
    "FROM table | LET nested.c.f = 1 | SELECT nested.c.d, nested.c.f",
    r#"
        SELECT
          CAST(
            ROW(ROW("nested"."c"."d", "nested"."c"."f")) AS ROW("c" ROW("d" BIGINT, "f" BIGINT))
          ) AS "nested"
        FROM (
            SELECT
                CAST(
                    ROW(
                        "nested"."a"
                        , "nested"."b"
                        , ROW("nested"."c"."d", "nested"."c"."e", 1)
                    ) AS ROW("a" BIGINT, "b" VARCHAR, "c" ROW("d" BIGINT, "e" VARCHAR, "f" BIGINT))
                ) AS "nested"
                , "t1"
                , "t2"
                , "t3"
            FROM
                "table"
        )
    "#
)]
pub fn test_dotted_select(#[case] hamelin: String, #[case] expected: String) -> anyhow::Result<()> {
    shared::compare(compiler(), hamelin, expected)
}