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"""Test the select_crawler module."""
import pytest
from sqlfluff.core.linter.linter import Linter
from sqlfluff.utils.analysis.query import Query
def _parse_and_crawl_outer(sql):
"""Helper function for select crawlers.
Given a SQL statement this crawls the SQL and instantiates
a Query on the outer relevant segment.
"""
linter = Linter(dialect="ansi")
parsed = linter.parse_string(sql)
# Make sure it's fully parsable.
assert "unparsable" not in parsed.tree.descendant_type_set
# Create a crawler from the root segment.
query = Query.from_root(parsed.tree, linter.dialect)
# Analyse the segment.
return query, linter
@pytest.mark.parametrize(
"sql, expected_json",
[
(
# Test trivial query.
"select 1",
{"selectables": ["select 1"]},
),
(
# Test set expression.
"select 1 union select 2",
{"selectables": ["select 1", "select 2"]},
),
(
# Test multiple CTEs.
"with cte1 as (select 1 as x), cte2 as (select 2 as y) "
"select * from cte1 join cte2 using (x)",
{
"ctes": {
"CTE1": {"selectables": ["select 1 as x"]},
"CTE2": {"selectables": ["select 2 as y"]},
},
"query_type": "WithCompound",
"selectables": ["select * from cte1 join cte2 using (x)"],
},
),
(
# Nested CTEs (from AM04 test suite)
"""
with a as (
with b as (select 1 from c)
select * from b
)
select * from a
""",
{
"ctes": {
"A": {
"ctes": {"B": {"selectables": ["select 1 from c"]}},
"query_type": "WithCompound",
"selectables": ["select * from b"],
}
},
"query_type": "WithCompound",
"selectables": ["select * from a"],
},
),
(
# Nested CTEs (from AM04 test suite)
"""
with b as (select 1 from c)
select * from (
with a as (select * from b)
select * from a
)
""",
{
"ctes": {"B": {"selectables": ["select 1 from c"]}},
"query_type": "WithCompound",
"selectables": [
"select * from (\n"
" with a as (select * from b)\n"
" select * from a\n"
" )"
],
"subqueries": [
# NOTE: Subquery from the FROM clause.
{
"ctes": {"A": {"selectables": ["select * from b"]}},
"query_type": "WithCompound",
"selectables": ["select * from a"],
},
],
},
),
(
# Test that subquery in "from" not included.
"select a.x from (select z from b)",
{
"selectables": ["select a.x from (select z from b)"],
"subqueries": [{"selectables": ["select z from b"]}],
},
),
(
# Test that subquery in "from" / "join" not included.
"select a.x from a join (select z from b) as b on (a.x = b.x)",
{
"selectables": [
"select a.x from a join (select z from b) as b on (a.x = b.x)"
],
"subqueries": [{"selectables": ["select z from b"]}],
},
),
(
# In CTE main query, test that subquery in "from" not included.
"with prep as (select 1) select a.x from (select z from b)",
{
"ctes": {"PREP": {"selectables": ["select 1"]}},
"query_type": "WithCompound",
"selectables": ["select a.x from (select z from b)"],
"subqueries": [{"selectables": ["select z from b"]}],
},
),
(
# In CTE main query, test that subquery in "from" / "join" not included.
"with prep as (select 1) "
"select a.x from a join (select z from b) as b on (a.x = b.x)",
{
"ctes": {"PREP": {"selectables": ["select 1"]}},
"query_type": "WithCompound",
"selectables": [
"select a.x from a join (select z from b) as b on (a.x = " "b.x)"
],
"subqueries": [{"selectables": ["select z from b"]}],
},
),
(
"""with prep_1 as (
with d as (
select x, z from b
)
select * from d
)
select
a.x, a.y, b.z
from a
join prep_1 using (x)
""",
{
"ctes": {
"PREP_1": {
"ctes": {
"D": {"selectables": ["select x, z from b"]},
},
"query_type": "WithCompound",
"selectables": ["select * from d"],
}
},
"query_type": "WithCompound",
"selectables": [
"select\n a.x, a.y, b.z\nfrom a\njoin prep_1 using (x)"
],
},
),
# Test with a UNION as the main selectable of a WITH
(
"with a as (select 1), b as (select 2) "
"select * from a union select * from b\n",
{
"ctes": {
"A": {"selectables": ["select 1"]},
"B": {"selectables": ["select 2"]},
},
"query_type": "WithCompound",
"selectables": [
"select * from a",
"select * from b",
],
},
),
# Test with a VALUES clause in a WITH
(
"WITH txt AS ( VALUES (1, 'foo') ) SELECT * FROM txt\n",
{
"ctes": {
"TXT": {"selectables": ["VALUES (1, 'foo')"]},
},
"query_type": "WithCompound",
"selectables": [
"SELECT * FROM txt",
],
},
),
# Test with Subqueries
(
"SELECT (\n"
" SELECT other_table.other_table_field_1 FROM other_table\n"
" WHERE other_table.id = field_2\n"
") FROM\n"
"(SELECT * FROM some_table) AS my_alias\n",
{
"selectables": [
"SELECT (\n"
" SELECT other_table.other_table_field_1 FROM other_table\n"
" WHERE other_table.id = field_2\n"
") FROM\n"
"(SELECT * FROM some_table) AS my_alias",
],
"subqueries": [
{
"selectables": [
"SELECT other_table.other_table_field_1 FROM other_table\n"
" WHERE other_table.id = field_2",
]
},
{"selectables": ["SELECT * FROM some_table"]},
],
},
),
# Test a MERGE
(
"""MERGE INTO t USING (SELECT * FROM u) AS u ON (a = b)
WHEN MATCHED THEN
UPDATE SET a = b
WHEN NOT MATCHED THEN
INSERT (b) VALUES (c);""",
{
"selectables": [
"""MERGE INTO t USING (SELECT * FROM u) AS u ON (a = b)
WHEN MATCHED THEN
UPDATE SET a = b
WHEN NOT MATCHED THEN
INSERT (b) VALUES (c)""" # NOTE: No trailing semicolon
],
"subqueries": [{"selectables": ["SELECT * FROM u"]}],
},
),
# Test a DELETE
(
"""DELETE FROM agent1
WHERE EXISTS(
SELECT customer.cust_id FROM customer
WHERE agent1.agent_code <> customer.agent_code);""",
{
"selectables": [
"""SELECT customer.cust_id FROM customer
WHERE agent1.agent_code <> customer.agent_code"""
]
},
),
# Test an UPDATE
(
"""UPDATE my_table
SET row_sum = (
SELECT COUNT(*) AS row_sum
FROM
another_table
WHERE
another_table.id = my_tableeee.id
)""",
{
"selectables": [
"""SELECT COUNT(*) AS row_sum
FROM
another_table
WHERE
another_table.id = my_tableeee.id"""
]
},
),
],
)
def test_select_crawler_constructor(sql, expected_json):
"""Test Query when created using constructor."""
query, _ = _parse_and_crawl_outer(sql)
assert all(cte.cte_definition_segment is not None for cte in query.ctes.values())
query_dict = query.as_dict()
assert expected_json == query_dict
def test_select_crawler_nested():
"""Test invoking with an outer from_expression_segment."""
sql = """
select
a.x, a.y, b.z
from a
join (
with d as (
select x, z from b
)
select * from d
) using (x)
"""
query, linter = _parse_and_crawl_outer(sql)
inner_from = (
query.selectables[0].select_info.table_aliases[1].from_expression_element
)
inner_select = next(inner_from.recursive_crawl("with_compound_statement"))
inner_query = Query.from_segment(inner_select, linter.dialect)
assert inner_query.as_dict() == {
"selectables": [
"select * from d",
],
"ctes": {"D": {"selectables": ["select x, z from b"]}},
"query_type": "WithCompound",
}
|
