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EXTERNAL TABLE

Config path: /<database>/<schema>/external_table/<name>.yaml

Example:

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]

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Schema

  • columns (dict)

    • {key} (ident) - column name

    • {value} (dict)

      • type (str) - full data type with optional "NOT NULL" constraint (not enforced)

      • 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

    • file_format (ident) - file format for 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

  • integration (ident) - notification integration name for Azure

  • 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

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Policy reference parameters

  • row_access_policy (dict)

    • policy_name (ident) - name of ROW ACCESS POLICY

    • columns (list)

      • {items} (ident) - reference column names

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Usage notes

  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_FORMAT object.

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Links

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