/** String concatenation operator */
public void operatorConcat(HplsqlParser.Expr_concatContext ctx) {
StringBuilder val = new StringBuilder();
int cnt = ctx.expr_concat_item().size();
boolean nulls = true;
for (int i = 0; i < cnt; i++) {
Var c = evalPop(ctx.expr_concat_item(i));
if (!c.isNull()) {
val.append(c.toString());
nulls = false;
}
}
if (nulls) {
evalNull();
} else {
evalString(val);
}
}
