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Field Name | Type | Description |
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Label* | String | The name for the Snap. You can modify this to be more specific, especially if you have more than one of the same Snap in your Pipeline. Default Value: ELT Cast Function
Example: CastFunctions_Testing |
Get preview data | Checkbox | Select this checkbox to include a preview of the query's output. The Snap performs limited execution and generates a data preview during Pipeline validation. | Info |
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In case of ELT Pipelines, only the SQL query flows through the Snaps but not the actual source data. Hence, the preview data for a Snap is the result of executing the SQL query that the Snap has generated in the Pipeline. |
The number of records displayed in the preview (upon validation) is the smaller of the following: Rendering Complex Data Types in Databricks Lakehouse Platform | Note |
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Based on the data types of the fields in the input schema, the Snap renders the complex data types like map and struct as object data type and array as an array data type. It renders all other incoming data types as-is except for the values in binary fields are displayed as a base64 encoded string and as string data type. |
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Pass through | Checkbox | Select this checkbox to specify that the Snap must include the incoming document (SQL query) in its output document. | Note |
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If this checkbox is selected and there are no conditional functions defined in the fieldsets below, Subquery Pushdown Optimization logically ignores this Snap—sends the input SQL query coming from the immediately upstream Snap as its output SQL query. |
| Info |
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If pass through is checked and no rows in the column to data t ype Mapping table, then the SQL would be
SELECT * FROM (SELECT * FROM <inputSqlString>) Data_Type_<random_table_name> If pass through is checked and rows are specified in the Column to Data Type Mapping Table, then the SQL would be
SELECT *, CAST (<column name1> AS <data type1>) AS <alias_name1>,
CAST (<column name2> AS <data type2>) AS <alias_name2>,
.... FROM (SELECT * FROM <inputSqlString>) Data_Type_<random_table_name> If pass through is not checked and rows are specified in the Column to Data Type Mapping Table, then the SQL would be
SELECT *, CAST (<column name1> AS <data type1>) AS <alias_name1>,
CAST (<column name2> AS <data type2>)AS <alias_name2>,
.... FROM (SELECT * FROM <inputSqlString>) Data_Type_<random_table_name> If pass through is not checked and rows are not specified in the Column to Data Type Mapping Table, then it would result in an error.
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Default Value: Not selected
Example: Selected |
Cast functions | Specify your SQL expressions, data type and the relevant alias using this fieldset. Click  to add a new row. Ensure that you specify each expression in a separate row. |
ExpressionFunction* | String/Expression | Specify your function/operation to be performed in the specified columns. Ensure that you specify each function in a separate row. |
ArgumentData Type* | String/Expression | Each of the function needs only one value/argument. Hence, specify an argument Specify the data type for the selected expression/function. Clickto retrieve the list of the supported aggregate functions. This is typically a column name in your source table. Each of the function needs only one value.
Default Value: None.
Example: ORDER_ID |
Alias* | String | Specify the column in which the result of the binary function has to be displayed. You can also reference this name in downstream Snaps to process the data further. Default Value: None.
Example: A_ORDIDS |
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Error | Reason | Resolution |
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Missing property value | You have not specified a value for the mandatory field where this message is displayed. | Ensure that you specify appropriate values for all mandatory fields in the Snap configuration. |
Invalid placement of ELT Cast Function snap | ELT Cast Function Snap cannot be used at the start of a Pipeline. | Move the ELT Cast Function Snap to either the middle or the end of the Pipeline. |
CAST (DEPT AS BINARY) is not a natural function for Snowflake. It displays the following error message. net.snowflake.client.jdbc.SnowflakeSQLException: The following string is not a legal hex-encoded value: 'operat'
(CDW: Snowflake) | In the SQL query, SELECT CAST(DEPT AS BINARY) AS dept_binary FROM BIGDATAQA.TEST_DATA.org10, CAST (DEPT AS BINARY) is not a natural function for Snowflake. | Instead of (DEPT AS BINARY), you can use: Examples: insert into TEST_DATA.demo_binary_hex (b) select to_binary(hex_encode('LOGO'), 'HEX');
select as_binary(binary1) as "Binary" from TEST_DATA.type_as_binary;
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Examples
See Also
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Endpoint Doc Link 1
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Endpoint Doc Link 2
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https://docs-snaplogic.atlassian.net/wiki/spaces/SD/pages/1439233/Glossary
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