models-parser 0.2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![warn(clippy::all)]
//! Test SQL syntax specific to Snowflake. The parser based on the
//! generic dialect is also tested (on the inputs it can handle).

#[macro_use]
mod test_utils;
use test_utils::*;

use models_parser::ast::*;
use models_parser::dialect::{GenericDialect, SnowflakeDialect};
use models_parser::parser::ParserError;
use models_parser::tokenizer::*;

#[test]
fn test_snowflake_create_table() {
    let sql = "CREATE TABLE _my_$table (am00unt number)";
    match snowflake_and_generic().verified_stmt(sql) {
        Statement::CreateTable(table) => {
            assert_eq!("_my_$table", table.name.to_string());
        }
        _ => unreachable!(),
    }
}

#[test]
fn test_snowflake_single_line_tokenize() {
    let sql = "CREATE TABLE# this is a comment \ntable_1";
    let dialect = SnowflakeDialect {};
    let mut tokenizer = Tokenizer::new(&dialect, sql);
    let tokens = tokenizer.tokenize().unwrap();

    let expected = vec![
        Token::make_keyword("CREATE"),
        Token::Whitespace(Whitespace::Space),
        Token::make_keyword("TABLE"),
        Token::Whitespace(Whitespace::SingleLineComment {
            prefix: "#".to_string(),
            comment: " this is a comment \n".to_string(),
        }),
        Token::make_word("table_1", None),
    ];

    assert_eq!(expected, tokens);

    let sql = "CREATE TABLE// this is a comment \ntable_1";
    let mut tokenizer = Tokenizer::new(&dialect, sql);
    let tokens = tokenizer.tokenize().unwrap();

    let expected = vec![
        Token::make_keyword("CREATE"),
        Token::Whitespace(Whitespace::Space),
        Token::make_keyword("TABLE"),
        Token::Whitespace(Whitespace::SingleLineComment {
            prefix: "//".to_string(),
            comment: " this is a comment \n".to_string(),
        }),
        Token::make_word("table_1", None),
    ];

    assert_eq!(expected, tokens);
}

#[test]
fn test_sf_derived_table_in_parenthesis() {
    // Nesting a subquery in an extra set of parentheses is non-standard,
    // but supported in Snowflake SQL
    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM ((SELECT 1) AS t)",
        "SELECT * FROM (SELECT 1) AS t",
    );
    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (((SELECT 1) AS t))",
        "SELECT * FROM (SELECT 1) AS t",
    );
}

#[test]
fn test_single_table_in_parenthesis() {
    // Parenthesized table names are non-standard, but supported in Snowflake SQL
    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN (b))",
        "SELECT * FROM (a NATURAL JOIN b)",
    );
    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN ((b)))",
        "SELECT * FROM (a NATURAL JOIN b)",
    );
}

#[test]
fn test_single_table_in_parenthesis_with_alias() {
    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN (b) c )",
        "SELECT * FROM (a NATURAL JOIN b AS c)",
    );

    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN ((b)) c )",
        "SELECT * FROM (a NATURAL JOIN b AS c)",
    );

    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN ( (b) c ) )",
        "SELECT * FROM (a NATURAL JOIN b AS c)",
    );

    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a NATURAL JOIN ( (b) as c ) )",
        "SELECT * FROM (a NATURAL JOIN b AS c)",
    );

    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a alias1 NATURAL JOIN ( (b) c ) )",
        "SELECT * FROM (a AS alias1 NATURAL JOIN b AS c)",
    );

    snowflake_and_generic().one_statement_parses_to(
        "SELECT * FROM (a as alias1 NATURAL JOIN ( (b) as c ) )",
        "SELECT * FROM (a AS alias1 NATURAL JOIN b AS c)",
    );

    let res = snowflake_and_generic().parse_sql_statements("SELECT * FROM (a NATURAL JOIN b) c");
    assert_eq!(
        ParserError::ParserError("Expected end of statement, found: c".to_string()),
        res.unwrap_err()
    );

    let res = snowflake().parse_sql_statements("SELECT * FROM (a b) c");
    assert_eq!(
        ParserError::ParserError("duplicate alias b".to_string()),
        res.unwrap_err()
    );
}

fn snowflake() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(SnowflakeDialect {})],
    }
}

fn snowflake_and_generic() -> TestedDialects {
    TestedDialects {
        dialects: vec![Box::new(SnowflakeDialect {}), Box::new(GenericDialect {})],
    }
}