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EXTERNAL TABLE
Config path:
/<database>/<schema>/external_table/<name>.yamlExample:
columns:
dt:
type: DATE
expr: "to_date(split_part(metadata$filename, '/', 2))::date"
comment: "Date of ingestion"
id:
type: NUMBER(38,0) NOT NULL
expr: "$1:id::number(38,0)"
name:
type: VARCHAR(255) NOT NULL
expr: "$1:name::varchar(255)"
location:
stage: test_external_stage
file_format: test_parquet_format
partition_by: [dt]
- columns (dict)
- {key} (ident) - column name
- {value} (dict)
- expr (str) - SQL expression describing column
- comment (str)
- location (dict)
- stage (ident) - stage name
- path (str) - path prefix for files stage
- pattern (str) - regular expression to filter files in stage
- partition_by (list)
- {items} (ident) - column names for PARTITION BY
- partition_type (str) - example:
USER_DEFINED - auto_refresh (bool) - enable
AUTO_REFRESH(default:False) - refresh_on_create (bool) - refresh once immediately after creation (default:
False) - aws_sns_topic (str) - SNS topic for S3 bucket
- table_format (str) - example:
DELTA - comment (str)
- primary_key (list)
- {items} (ident) - column names for PRIMARY KEY constraint
- unique_keys (list)
- {items} (list)
- {items} (ident) - column names for UNIQUE KEY constraint
- foreign_keys (list)
- {items} (dict) - FOREIGN KEY definitions
- columns (list)
- {items} (ident) - column names from current table
- ref_table (ident) - reference table
- ref_columns (list)
- {items} (ident) - column names from reference table
- 1.If automatic metadata refresh it not available for your cloud provider, it should be implemented separately. SnowDDL cannot refresh external table metadata for you.
- 2.file_format can only be specified by name referencing to
FILE_FORMATobject.
Last modified 1yr ago