![]() Set the TolerateConcatOverflow option for Odbc.DataSource to true.Ensure that your database can support up-conversion to CLOB types when string concatenation overflow occurs.If you're receiving a folding error when trying to concatenate two strings that potentially overflow the maximum size of the underlying database type: The M engine does basic type size limit validation as part of its query folding logic. Concatenation of strings in DirectQuery mode The queries generated in DirectQuery mode are significantly more complex (that is, use of sub-selects, COALESCE statements, and aggregations). Once you have simple queries working, you can then try DirectQuery scenarios (for example, building reports in the Report Views). These entries should contain more information as to why the query engine believes that query folding isn't possible for this operation. Search for OdbcQuery/FoldingWarning entries in the trace files.Open the trace files in your text editor of choice.Copy the trace files to a new directory.Details about the cause of the failure should be emitted to the trace logs. Note the failure, remove the step, and move to the next test case. Expressions that fail to fold will result in a warning bar.Add a column calculated from other columns ( = + ).Connect to and visualise any data, and seamlessly infuse the visuals into the apps you use every day. Aggregate / Group By different column combinations. Power BI is a unified, scalable platform for self-service and enterprise business intelligence (BI).Set other range filters (greater than, less than).Set equality filters on different data types (int, string, bool, and so on).Take the First N rows (for example, 10).Manipulate the query in various ways, including:.Select a table in the navigator, and select Edit.Connect to your data source, and select Direct Query mode.Open Power BI desktop, and enable tracing.Here are steps you can take for initial testing in Power BI Desktop: Close Power BI Desktop to ensure all log files are flushed to disk.Select the Open traces folder link (should be %LOCALAPPDATA%/Microsoft/Power BI Desktop/Traces).Go to File > Options and settings > Options.One of the basic tools for testing and troubleshooting an ODBC-based connector is the ability to use tracing in Power BI Desktop to determine why errors may be occurring. This section describes how to set up and use some test and troubleshooting tools. While you're building your ODBC-based connector, it's a good idea to occasionally test and troubleshoot the connector.
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