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fix: edge case in Snowflake information_schema.last_altered value #360

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merged 3 commits into from Sep 7, 2020
Merged

fix: edge case in Snowflake information_schema.last_altered value #360

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3dcd27d
fix: edge case in Snowflake information_schema.last_altered value
instazackwu Sep 4, 2020
3eedcc0
Correct file
instazackwu Sep 4, 2020
9354d63
Have where clause instead of nvl for null last_altered
instazackwu Sep 4, 2020
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3 changes: 2 additions & 1 deletion databuilder/extractor/snowflake_table_last_updated_extractor.py
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Expand Up @@ -21,6 +21,7 @@ class SnowflakeTableLastUpdatedExtractor(Extractor):
snowflake-connector-python
snowflake-sqlalchemy
"""
# https://docs.snowflake.com/en/sql-reference/info-schema/views.html#columns
# 'last_altered' column in 'TABLES` metadata view under 'INFORMATION_SCHEMA' contains last time when the table was
# updated (both DML and DDL update). Below query fetches that column for each table.
SQL_STATEMENT = """
Expand All @@ -47,7 +48,7 @@ class SnowflakeTableLastUpdatedExtractor(Extractor):
DEFAULT_CLUSTER_NAME = 'master'

DEFAULT_CONFIG = ConfigFactory.from_dict(
{WHERE_CLAUSE_SUFFIX_KEY: ' ',
{WHERE_CLAUSE_SUFFIX_KEY: ' WHERE t.last_altered IS NOT NULL ',
CLUSTER_KEY: DEFAULT_CLUSTER_NAME,
USE_CATALOG_AS_CLUSTER_NAME: True,
DATABASE_KEY: 'snowflake',
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