mirror of
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152 lines
4.7 KiB
Python
152 lines
4.7 KiB
Python
# Copyright 2021 Collate
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Validate query parser logic
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"""
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# Prevent sqllineage from modifying the logger config
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# Disable the DictConfigurator.configure method while importing LineageRunner
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from logging.config import DictConfigurator
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from unittest import TestCase
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from metadata.generated.schema.type.tableUsageCount import TableColumn, TableColumnJoin
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from metadata.ingestion.lineage.parser import (
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get_clean_parser_table_list,
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get_involved_tables_from_parser,
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get_parser_table_aliases,
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get_table_joins,
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)
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configure = DictConfigurator.configure
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DictConfigurator.configure = lambda _: None
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from sqllineage.runner import LineageRunner
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# Reverting changes after import is done
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DictConfigurator.configure = configure
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class QueryParserTests(TestCase):
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"""
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Check methods from query_parser.py
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"""
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query = col_lineage = """
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SELECT
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a.col1,
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a.col2 + b.col2 AS col2,
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case
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when col1 = 3 then 'hello'
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else 'bye'
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end as new_col
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FROM foo a
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JOIN db.grault b
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ON a.col1 = b.col1
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JOIN db.holis c
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ON a.col1 = c.abc
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JOIN db.random d
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ON a.col2 = d.col2
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WHERE a.col3 = 'abc'
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"""
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parser = LineageRunner(col_lineage)
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def test_involved_tables(self):
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tables = {str(table) for table in get_involved_tables_from_parser(self.parser)}
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self.assertEqual(
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tables, {"db.grault", "db.holis", "<default>.foo", "db.random"}
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)
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def test_clean_parser_table_list(self):
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tables = get_involved_tables_from_parser(self.parser)
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clean_tables = set(get_clean_parser_table_list(tables))
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self.assertEqual(clean_tables, {"db.grault", "db.holis", "foo", "db.random"})
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def test_parser_table_aliases(self):
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tables = get_involved_tables_from_parser(self.parser)
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aliases = get_parser_table_aliases(tables)
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self.assertEqual(
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aliases, {"b": "db.grault", "c": "db.holis", "a": "foo", "d": "db.random"}
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)
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def test_get_table_joins(self):
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"""
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main logic point
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"""
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tables = get_involved_tables_from_parser(self.parser)
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clean_tables = get_clean_parser_table_list(tables)
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aliases = get_parser_table_aliases(tables)
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joins = get_table_joins(
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parser=self.parser, tables=clean_tables, aliases=aliases
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)
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self.assertEqual(
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joins["foo"],
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[
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TableColumnJoin(
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tableColumn=TableColumn(table="foo", column="col1"),
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joinedWith=[
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TableColumn(table="db.grault", column="col1"),
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TableColumn(table="db.holis", column="abc"),
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],
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),
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TableColumnJoin(
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tableColumn=TableColumn(table="foo", column="col2"),
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joinedWith=[
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TableColumn(table="db.random", column="col2"),
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],
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),
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],
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)
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def test_capitals(self):
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"""
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Example on how LineageRunner keeps capitals
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for column names
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"""
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query = """
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SELECT
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USERS.ID,
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li.id
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FROM TESTDB.PUBLIC.USERS
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JOIN testdb.PUBLIC."lowercase_users" li
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ON USERS.id = li.ID
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;
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"""
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parser = LineageRunner(query)
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tables = get_involved_tables_from_parser(parser)
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clean_tables = get_clean_parser_table_list(tables)
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aliases = get_parser_table_aliases(tables)
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joins = get_table_joins(parser=parser, tables=clean_tables, aliases=aliases)
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self.assertEqual(
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joins["testdb.public.users"],
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[
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TableColumnJoin(
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tableColumn=TableColumn(
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table="testdb.public.users", column="id"
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), # lowercase col
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joinedWith=[
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TableColumn(
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table="testdb.public.lowercase_users", column="ID"
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), # uppercase col
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],
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),
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],
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)
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