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Overview

SnapLogic’s ELT Snap Pack is a full pushdown optimization (FPDO) solution that extracts, loads, and transform (ELT) data in the target database by building ELT Pipelines that parse SQL queries. As such, the ELT Pipeline generates and executes SQL on the target database. ELT Snaps help you to make data available to the enterprise in quick time; eliminating delays in transforming data for your specific purpose.

  • Extract data from the source system (SaaS application)
  • Load it into your Data Warehouse in its raw format
  • Transform the data using the power of the cloud

Automating Data Integration with ELT

Features

  • Ease of Use
    • SQL passed between Snaps; execution on CDW (cloud data warehouse)
    • Visually build SQL Pipelines
    • Selectively Preview Data
    • Suggest capability
    • Extensive transformation capabilities
    • Load data using merge into 
  • Enhanced Connectivity
    • Independent Snap Pack
    • Snowflake account
  • Security
    • Prevent SQL Injection
  • Write transformed data to target databases hosted in the following cloud locations:

You can also execute an ELT Pipeline from a standard-mode Pipeline by utilizing the Pipeline Execute Snap.

Articles in this section

ELT Source-Target-Hosting Support Matrix

(Source) Data Storage

Cloud Data Warehouse (Target)(Target) Cloud Host 

AWS Simple Storage Service (S3)

Microsoft Azure

Azure External Location

Google Cloud  Storage

Amazon AWS

Microsoft Azure

Google Cloud Platform (GCP)

AzureBlob StorageADLS Gen2
Snowflake
Redshift
✔ *✔ *Azure Synapse
Databricks Lakehouse Platform

*ELT Snap Pack supports Azure Blob Storage and ADLS Gen2 as the external (source) locations for loading and transforming data into Azure Synapse.

See ELT Database Account for more details.

Supported JDBC JAR Versions

ELT Snaps automatically use a corresponding JDBC JAR file to connect to your target database and to perform the load and transform operations. 

Supported DatabaseCertified JDBC JAR File
Azure Synapsemssql-jdbc-8.4.1.jre8.jar
Databricks Lakehouse Platform (DLP)SimbaSparkJDBC42-2.6.17.1021.jar
Redshiftredshift-jdbc42-1.2.43.1067.jar
Snowflakesnowflake-jdbc-3.12.16.jar

Using Alternate JDBC JAR File Versions

We recommend you to let the ELT Snaps use the listed JAR file versions. However, you may use a different JAR file version of your choice.

Known Issues

  • The Snaps - ELT LoadELT Merge-IntoELT Insert-Select and ELT Select, display the Schema Name field suggestions from all databases that the Snap account user can access, instead of the database selected in the Snap account or the Snap Settings.
  • ELT Transform Snap displays incorrect data types (string instead of the actual data type) for column names populated in its Input schema section.

  • ELT Pipelines targeting a Databricks Lakehouse Platform (DLP) instance might fail due to a very long or complex SQL query that they build. As a workaround, you can set an advanced (URL) property useNativeQuery to 1 in your ELT Database Account configuration as shown below:
  • In any of the supported target databases, this Snap does not appropriately identify nor render column references beginning with an _ (underscore) inside SQL queries/statements that use the following constructs and contexts (the Snap works as expected in all other scenarios):
    • WHERE clause (ELT Filter Snap)
    • WHEN clause
    • ON condition (ELT Join, ELT Merge Into Snaps)
    • HAVING clause
    • QUALIFY clause
    • Insert expressions (column names and values in ELT Insert Select, ELT Load, and ELT Merge Into Snaps)
    • Update expressions list (column names and values in ELT Merge Into Snap)
    • Secondary AND condition
    • Inside SQL query editor (ELT Select and ELT Execute Snaps)

Workaround

As a workaround while using these SQL query constructs, you can:

  • Precede this Snap with an ELT Transform Snap to re-map the '_' column references to suitable column names (that do not begin with an _ ) and reference the new column names in the next Snap, as needed.
  • In case of Databricks Lakehouse Platform where CSV files do not have a header (column names), a simple query like SELECT * FROM CSV.`/mnt/csv1.csv` returns default names such as _c0, _c1, _c2 for the columns which this Snap cannot interpret. To avoid this scenario, you can:
    • Write the data in the CSV file to a DLP table beforehand, as in: CREATE TABLE csvdatatable (a1 int, b1 int,…) USING CSV `/mnt/csv1.csv` where a1, b1, and so on are the new column names.
    • Then, read the data from this new table (with column names a1, b1, and so on) using a simple SELECT statement.
  • In case of Databricks Lakehouse Platform, all ELT Snaps' preview data (during validation) contains a value with precision higher than that of the actual floating point value (float data type) stored in the Delta. For example, 24.123404659344 instead of 24.1234. However, the Snap reflects the exact values during Pipeline executions.

Snap Pack History

 Click here to expand...

Release

Snap Pack Version 

Date

Type

Updates

4.26main11181 Stable
  • Enhanced the ELT Snap preview to support the following Snowflake data types: array, object, variant, and timestamp.

    • The Snaps convert the values to hexadecimal (HEX) equivalents—the default setting for the session parameter BINARY_OUTPUT_FORMAT in Snowflake. See Session Parameters for Binary Values for more information.

    • If this setting is different from hexadecimal (such as base64) in the Snowflake table, the Snaps still convert the values to hexadecimal equivalents for rendering them in the Snap preview.

  • Enhanced all ELT Snaps to display the Get preview data checkbox below the Snap's Label field.
  • The ELT Database account is now mandatory for all Snaps in the ELT Snap Pack.

    Breaking change

    Starting with the 4.26 release, all Snaps in the ELT Snap Pack (except the ELT Copy Snap) require an account to connect to the respective target database. Your existing Pipelines that do not use an account may fail. We recommend you to associate an ELT Database Account to each of the ELT Snaps (except ELT Copy Snap) for your Pipelines.

  • Enhanced the ELT Aggregate Snap to support Linear Regression functions on Redshift and Azure Synapse. The Snap also supports these functions on Databricks Lakehouse Platform.
  • Enhanced the ELT Execute Snap to enable running multiple DML, DDL, and DCL SQL statements from the same Snap instance.
  • Enhanced the ELT Join Snap to:
    • Support LEFT ANTI JOIN and LEFT SEMI JOIN types on all supported databases.
    • Display or hide the Resultant Column Names Prefix Type field based on the target database selected in the Snap's account.
  • Enhanced the ELT Load and ELT SCD2 Snaps to provide a list of suggested data types, while adding columns to or creating a table.
4.25-Patch425patches10017 Latest
  • Updated the ELT SCD2 Snap to replace End date of historical row option in the Meaning field of Target Table SCD2 Fields field set with End Date of Current Row.

    Breaking change

    This may cause the existing Pipelines to fail as the End date of historical row option no longer exists.

    You need to make the following update in the ELT SCD2 Snap's settings across your Pipelines after upgrading your Snap Pack to this patch:

    • Select End Date of Current Row from the Meaning drop-down list in the second entry (highlighted in the image).
  • Fixed the issue with the ELT Insert Select Snap containing an open output preview that fails to retrieve output preview data in case of Redshift and Azure Synapse databases, though the Pipeline runs work as expected.
  • Fixed an issue where the ELT Execute Snap does not error out (Snap turns Green) even when running an SQL query to drop a non-existent table from a Snowflake or Azure Synapse database.
  • [Update on ]: Enhanced the ELT Snap previews to support the following data types: array, object, variant, and timestamp.
    • The Snaps convert the values to hexadecimal (HEX) equivalents—the default setting for the session parameter BINARY_OUTPUT_FORMAT in Snowflake. See Session Parameters for Binary Values for more information.
    • If this setting is different from hexadecimal (such as base64) in the Snowflake table, the Snaps still convert the values to hexadecimal equivalents for rendering them in the Snap previews.
4.25-Patch425patches9725 Latest
  • Enhanced the ELT Snap preview to display the exact binary and varbinary values from Snowflake database during Pipeline validation, by converting the values to hexadecimal equivalents—the default setting in SnowflakeIf the setting is different from hexadecimal in the Snowflake table, then the Snaps still convert the values to hexadecimal for rendering the Snap preview.
  • Enhanced the ELT Transform Snap to display the appropriate data type (binary or varbinary) for the column names populated in the output schema.
  • Enhanced the ELT Window Functions Snap to address potential issues due to an incorrect definition for MINUS function in case of Redshift and Azure Synapse databases.
4.25main9554 Stable
  • Starting with the 4.25 release, SnapLogic has now certified the ELT Snap Pack to work with Snowflake hosted on Google Cloud Platform (GCP) as the target database, in addition to the other flavors of Snowflake hosted on AWS and Microsoft Azure
  • Introduced the ELT Execute Snap to enable you to run DML, DDL, and DCL SQL queries in Snowflake in Snowflake, Redshift, and Azure Synapse.
  • Introduced the ELT SCD2 Snap to support Type 2 Slowly Changing Dimensions (SCD2) updates to the target databases—Snowflake, Redshift, and Azure Synapse.
  • Enhanced the ELT Database Account to introduce:
    • Support for Google Cloud Storage as a storage location (source) in addition to AWS S3 and Azure Data Lake Storage (ADLS) when your target database is Snowflake.
    • Automatic download of the JDBC driver required for the selected Database Type using the new Download JDBC Driver Automatically check box.
  • Enhanced the ELT Load Snap to prevent changes to existing tables during Pipeline validation. If you set the Load Action as Drop and Create table, and the target table does not exist, the Snap creates a new (empty) target table based on the schema specified in its settings.
  • Enhanced the ELT Window Functions Snap to support Covariance, Correlation, and Linear Regression Functions on Snowflake, Redshift, and Azure Synapse databases. The Snap uses function-specific query re-writes to support these functions on Redshift and Azure Synapse databases.
  • Enhanced the ELT Merge Into and ELT Insert Select Snaps to support up to one output view, and added the Get Preview Data check box to these Snaps. You can now connect downstream ELT Snaps to these Snaps.
4.24-Patch424patches8793 Latest
  • Fixes the issue of production job failures due to ELT Insert Select Snap after upgrading to 4.24 GA by updating the ELT Transform Snap to continue allowing duplication of fields in the Expression list for the Pipeline to complete successfully.

No changes are needed to your existing Pipelines.

  • Fixes the column name collision issue in the Snap's output when the two tables being joined have columns with the same/identical names. You can specify the extent of prefix (that is, to prefix all columns, only duplicate columns, or no prefix) using the Resultant Column Names Prefix Type drop-down list. Based on the prefix you choose, a table alias name is prefixed to the identical columns in the output.

Behavior Change

The behavior of ELT Load Snap for Load Action during Pipeline validation across the supported databases is as follows:

Append rows to existing table: Does not append the data from the source files into the target table.

Overwrite existing table: Does not overwrite the data.

Drop and Create table: Does not drop the target table even if it exists, but the Snap creates a new target table if a table does not exist.

Alter table: Does not modify the schema of the target table.

4.24main8556 Stable
  • Adds support for Azure Synapse database. You can now use the ELT Snap Pack to transform tables in the Snowflake, Redshift as well as Azure Synapse databases.

Updates the Snap Pack with the following features:

  • ELT Database Account: Enhances the ELT Database Account to support the Azure Synapse database.
  • ELT Aggregate: Enhances the Snap to:
  • Support Azure Synapse's T-SQL aggregate functions and the aggregate functions in Snowflake and Redshift databases.
    • General Aggregate Function COUNT_IF in Snowflake.
    • General Aggregate Functions in Snowflake.
    • Linear Regression Aggregate Functions in Snowflake.
    • Aggregate Concatenation Functions in Snowflake, Redshift, and Azure Synapse.
    • Percentile Distribution Functions in Snowflake and Redshift.
  • Suggest appropriate column names to select from, in the Snap fields. This applies to Snowflake, Redshift, and Azure Synapse databases.
  • ELT Insert Select: Enhances the Snap to:
    • Suggest appropriate column names to select from, in the Snap fields.
    • Create Hash-distributed tables using the Target Table Hash Distribution Column (Azure Synapse Only) field when the Load Action is selected as Drop and Create table and a condition like WHEN NOT MATCHED BY TARGET.
  • ELT Join
    • Enhances the Snap to support Natural JOINS (NATURAL INNER JOIN, NATURAL LEFT OUTER JOIN, NATURAL RIGHT OUTER JOIN, and NATURAL FULL OUTER JOIN) in addition to the INNER, LEFT OUTER, RIGHT OUTER, FULL OUTER, and CROSS Joins in Azure Synapse Database. This enhancement also makes account configuration mandatory when using this Snap.
    • Fixes the column name collision issue in the Snap's result set when the two tables being joined have columns with the same/identical names.  You can specify the Resultant Column Names Prefix Type drop-down list. Based on the prefix type you choose, a table alias name is prefixed to identical columns in the output.
  • ELT Load: Enhances the Snap to:
    • Support the File Name Pattern option using Key Based Mechanism for Redshift database. 
    • Suggest appropriate column names to select from, in the Snap fields. This applies to Snowflake, Redshift, and Azure Synapse databases.
    • Create Hash-distributed tables using the Target Table Hash Distribution Column (Azure Synapse Only) field when the Load Action is selected as Drop and Create table.
  • ELT Merge Into: Enhances the Snap to:
    • Suggest appropriate column names to select from, in the Snap fields. This applies to Snowflake, Redshift, and Azure Synapse databases.
    • Include the Target Table Hash Distribution Column (Azure Synapse Only) field for the Snap to create hash-distributed tables always.
    • Include the Update Expression List - When Not Matched By Source field set to allow defining one or more Update Expressions for the WHEN clause - WHEN NOT MATCHED BY SOURCE. This applies to Azure Synapse database.
    • Include the Target Table Alias field to specify the alias name required for the target table. The Snap is also equipped with the ability to auto-replace the actual table names (with the alias name), if any, used in the ON clause condition, secondary AND conditions, Update Expression list, or Insert Expression list. This applies to Snowflake, Redshift, and Azure Synapse databases.
  • ELT Transform: Enhances the Snap to:
    • Display input schema and output schema based on the upstream and downstream Snaps connected to this Snap.
    • Delete fields mentioned in the Expression field from the Snap's output when the mappings have an empty Target Path
  • ELT Window Functions: Enhances the Snap to support the following Window Functions in addition to the existing ones:
    • Value Based Analytic Functions
    • LEAD and LAG Analytic Functions
  • Fixes the issue of displaying generic error messages for Triggered Task failures with ELT Pipelines by displaying detailed error messages for ease in debugging.
4.23main7430 StableIntroduces the following Snaps:
  • ELT Load: Loads data from AWS S3 buckets and Azure clusters into the Snowflake and Redshift tables.
  • ELT Sample: Generates a data subset from the source table. 
  • ELT Pivot: Converts row data into column data.
  • ELT Unpivot: Converts column data into row data.
  • ELT Window Functions: Provides support for SQL Window Functions in ELT Pipelines.

4.22

main6403

 

Stable

Introduces the ELT Snap Pack that provides you with the Extract, Load, and Transform (ELT) capabilities. Use the following Snaps to build SQL queries that are executed in the Snowflake database:

  • ELT Aggregate : Builds SQL query to perform aggregate functions such as SUM, COUNT, MIN, and MAX. Also offers the GROUP BY functionality.
  • ELT Copy: Creates copies of the input SQL query. 
  • ELT Filter: Adds a WHERE clause in the input SQL query. Use this capability to create filters/conditions for your data set. 
  • ELT Insert Select: Performs the INSERT INTO SELECT operation on the specified table. 
  • ELT Intersect: Adds an INTERSECT SQL operator in the input queries.
  • ELT Join: Builds SQL query with a JOIN clause.
  • ELT Limit: Adds a LIMIT clause in the incoming SQL query.
  • ELT Merge Into: Performs the MERGE INTO operation on the specified table.
  • ELT Minus: Adds a MINUS SQL operator in the input queries.
  • ELT Select: Builds an SQL SELECT query and provides a built-in SQL query editor that enables you to construct complex queries.
  • ELT Sort: Adds the ORDER BY keyword in the input query. 
  • ELT Transform: Builds transformation-based SQL queries for the specified table.
  • ELT Union: Adds a UNION ALL or UNION DISTINCT operator in the input queries.
  • ELT Unique: Builds a SELECT DISTINCT SQL query. 

See Also

SnapLogic Product Glossary

Getting started with SnapLogic

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