cryptoe commented on code in PR #12920:
URL: https://github.com/apache/druid/pull/12920#discussion_r951369395
##########
processing/src/main/java/org/apache/druid/query/expression/NestedDataExpressions.java:
##########
@@ -139,38 +149,45 @@ public ToJsonExpr(List<Expr> args)
public ExprEval eval(ObjectBinding bindings)
{
ExprEval input = args.get(0).eval(bindings);
- return ExprEval.ofComplex(
- TYPE,
- maybeUnwrapStructuredData(input)
- );
+ try {
+ final Object unwrapped = unwrap(input);
+ final String stringify = unwrapped == null ? null :
jsonMapper.writeValueAsString(unwrapped);
+ return ExprEval.ofType(
+ ExpressionType.STRING,
+ stringify
+ );
+ }
+ catch (JsonProcessingException e) {
+ throw new IAE(e, "Unable to stringify [%s] to JSON",
input.value());
+ }
}
@Override
public Expr visit(Shuttle shuttle)
{
List<Expr> newArgs = args.stream().map(x ->
x.visit(shuttle)).collect(Collectors.toList());
- return shuttle.visit(new ToJsonExpr(newArgs));
+ return shuttle.visit(new ToJsonStringExpr(newArgs));
}
@Nullable
@Override
public ExpressionType getOutputType(InputBindingInspector inspector)
{
- return TYPE;
+ return ExpressionType.STRING;
}
}
- return new ToJsonExpr(args);
+ return new ToJsonStringExpr(args);
}
}
- public static class ToJsonStringExprMacro implements ExprMacroTable.ExprMacro
+ public static class ParseJsonExprMacro implements ExprMacroTable.ExprMacro
{
- public static final String NAME = "to_json_string";
+ public static final String NAME = "parse_json";
Review Comment:
Is there a doc update required for this ?
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