Cannot use on non-SQL function – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.12-8.9

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Briefly, this error occurs when you try to use SQL-like syntax on a function that is not compatible with SQL in Elasticsearch. Elasticsearch supports a subset of SQL functions, and using unsupported functions will result in this error. To resolve this issue, you can either use a function that is supported by Elasticsearch’s SQL syntax or use the native Elasticsearch Query DSL, which provides more flexibility and functionality than the SQL interface.

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This guide will help you check for common problems that cause the log ” Cannot use {} on non-SQL function {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Cannot use {} on non-SQL function {}” class name is SqlFunctionResolution.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 @Override
 public Function buildResolved(UnresolvedFunction uf; Configuration cfg; FunctionDefinition def) {
 if (def instanceof SqlFunctionDefinition) {
 return ((SqlFunctionDefinition) def).builder().build(uf; cfg; true);
 }
 throw new ParsingException(uf.source(); "Cannot use {} on non-SQL function {}"; name(); def);
 }  @Override
 public boolean isValidAlternative(FunctionDefinition def) {
 return false; // think about this later.

 

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