Preview Snowflake Connector Bug with boolean values

[crispybc]

There seems to be a bug with the new preview Snowflake connector when retreiving BOOLEAN columns using native SQL query.  The values get returned as a string and when converting the column to a TRUE/FALSE column all values are turned to FALSE.

When using the connector explorer to return the full table from snowflake, the BOOLEAN columns are correctly detected as TRUE/FALSE columns.

[v-sdhruv]

Hi @crispybc ,
Just wanted to check if you had the opportunity to review the suggestions provided?
If the response has addressed your query, please accept it as a solution and give a 'Kudos' so other members can easily find it.
Thank You

[OwenAuger · Accepted solution]

Hi @crispybc - that does seem like a bug. I ran some tests out of curiosity and had exactly the same issue.

I'm not sure what the best approach is while this bug exists, but here are some observations of variations on the query:

1. Native query created using dialog box converts Boolean to text

-- ❌ Boolean columns > text
let
  Source = Value.NativeQuery(
    Snowflake.Databases("MY_SERVER.snowflakecomputing.com", "MY_WAREHOUSE", [Implementation = "2.0"]){
      [Name = "MY_DATABASE"]
    }[Data],
    "SELECT * FROM MY_SCHEMA.MY_VIEW",
    null,
    [EnableFolding = true]
  )
in
  Source

2. Setting EnableFolding = false fixes Boolean column type

I would only recommend this if no further transformation steps a required in Power Query.

-- ✅ Boolean columns > logical
let
  Source = Value.NativeQuery(
    Snowflake.Databases("MY_SERVER.snowflakecomputing.com", "MY_WAREHOUSE", [Implementation = "2.0"]){
      [Name = "MY_DATABASE"]
    }[Data],
    "SELECT * FROM MY_SCHEMA.MY_VIEW",
    null,
    [EnableFolding = false]
  )
in
  Source

3. Setting Implementation ="1.0" (old connector) but keeping EnableFolding = true fixes also Boolean column type

-- ✅ Boolean columns > logical
let
  Source = Value.NativeQuery(
    Snowflake.Databases("MY_SERVER.snowflakecomputing.com", "MY_WAREHOUSE", [Implementation = "1.0"]){
      [Name = "MY_DATABASE"]
    }[Data],
    "SELECT * FROM MY_SCHEMA.MY_VIEW",
    null,
    [EnableFolding = true]
  )
in
  Source

[v-sdhruv]

Hi @crispybc ,
This could be a bug or an issue related to data type interpretation when fetching the results.
You can try a temporary workaround by setting the column to integer using Advance query option while
Connecting to a Snowflake database from Power Query:

SELECT CASE WHEN boolean_column THEN 1 ELSE 0 END FROM your_table;

If you still encounter any issues you can raise you issues here:
https://community.fabric.microsoft.com/t5/Issues/idb-p/Issues

Additionally, you can go through this documentation where you can provide feedback for new preview Snowflake connector and learn about its limitations and known issues
https://learn.microsoft.com/en-us/power-query/connectors/snowflake#connect-using-advanced-options

Hope this helps!
If this answers your question, please Accept it as a solution and give it a 'Kudos' so others can find it easily.