clintropolis commented on a change in pull request #7388: Support LPAD and RPAD
sql function
URL: https://github.com/apache/incubator-druid/pull/7388#discussion_r271465238
##########
File path: core/src/main/java/org/apache/druid/math/expr/Function.java
##########
@@ -1206,4 +1206,61 @@ public ExprEval apply(List<Expr> args,
Expr.ObjectBinding bindings)
return ExprEval.of(expr.value() != null, ExprType.LONG);
}
}
+
+ class LpadFunc implements Function
+ {
+ @Override
+ public String name()
+ {
+ return "lpad";
+ }
+
+ @Override
+ public ExprEval apply(List<Expr> args, Expr.ObjectBinding bindings)
+ {
+ if (args.size() != 3) {
+ throw new IAE("Function[%s] needs 3 arguments", name());
+ }
+
+ String base =
NullHandling.nullToEmptyIfNeeded(args.get(0).eval(bindings).asString());
Review comment:
Does it make sense to pad empty values when sql compatible null handling is
not enabled?
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