Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r43471737
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/ExpressionTreeMaterializer.java
---
@@ -308,10 +334,115 @@ public LogicalExpression
visitFunctionCall(FunctionCall call, FunctionLookupCont
return matchedNonDrillFuncHolder.getExpr(call.getName(),
extArgsWithCast, call.getPosition());
}
+ if (hasUnionInput(call)) {
+ return rewriteUnionFunction(call, functionLookupContext);
+ }
+
logFunctionResolutionError(errorCollector, call);
return NullExpression.INSTANCE;
}
+ private static final Set<String> UNION_FUNCTIONS;
+
+ static {
+ UNION_FUNCTIONS = new HashSet<>();
+ for (MinorType t : MinorType.values()) {
+ UNION_FUNCTIONS.add("assert_" + t.name().toLowerCase());
+ UNION_FUNCTIONS.add("is_" + t.name().toLowerCase());
+ }
+ UNION_FUNCTIONS.add("typeof");
+ }
+
+ private boolean hasUnionInput(FunctionCall call) {
+ for (LogicalExpression arg : call.args) {
+ if (arg.getMajorType().getMinorType() == MinorType.UNION) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private LogicalExpression rewriteUnionFunction(FunctionCall call,
FunctionLookupContext functionLookupContext) {
--- End diff --
javadoc please
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