siddharthteotia commented on a change in pull request #5406:
URL: https://github.com/apache/incubator-pinot/pull/5406#discussion_r427580739
##########
File path:
pinot-common/src/main/java/org/apache/pinot/sql/parsers/CalciteSqlParser.java
##########
@@ -615,7 +620,44 @@ private static Expression toExpression(SqlNode node) {
funcExpr.getFunctionCall().addToOperands(toExpression(child));
}
}
+
+ if (FunctionRegistry.containsFunctionByName(funcName) &&
isCompileTimeEvaluationPossible(funcExpr)) {
+ int functionOperandsLength = funcSqlNode.getOperands().length;
+ FunctionInfo functionInfo =
FunctionRegistry.getFunctionByName(funcName);
+ Object[] arguments = new Object[functionOperandsLength];
+ for (int i = 0; i < functionOperandsLength; i++) {
+ SqlLiteral argSqlNode = (SqlLiteral) funcSqlNode.getOperands()[i];
+ arguments[i] = argSqlNode.toValue();
+ }
+ try {
+ FunctionInvoker invoker = new FunctionInvoker(functionInfo);
+ funcExpr =
RequestUtils.getLiteralExpression(invoker.process(arguments).toString());
+ } catch (Exception e) {
+ throw new SqlCompilationException("Unsupported Scalar function - "
+ funcName);
+ }
+ }
return funcExpr;
}
}
+
+ /**
+ * Utility method to check if the function can be evaluated during the query
compilation phae
+ * @param funcExpr
+ * @return true if all arguments are literals
+ */
+ private static boolean isCompileTimeEvaluationPossible(Expression funcExpr) {
Review comment:
Instead of this, why don't we just have a constant value function
registry where all compile time evaluated functions are registered. So this
check then becomes if the function is part of the constant value function
registry.
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