[BugFix] dictionary_get did not support third params for materialized…

… view (backport #52125) (#52222)

Co-authored-by: Rohit Satardekar <rohitrs1983@gmail.com>

fe/fe-core/src/main/java/com/starrocks/sql/ast/DictionaryGetExpr.java

@@ -62,7 +62,8 @@ protected DictionaryGetExpr(DictionaryGetExpr other) {
     @Override
     protected String toSqlImpl() {
         String message = "DICTIONARY_GET(";
-        for (int i = 0; i < this.children.size(); ++i) {
+        int size = (this.children.size() == 3) ? this.children.size() - 1 : this.children.size();
+        for (int i = 0; i < size; ++i) {
             Expr expr = this.children.get(i);
             message += expr.toSql();
             message += ", ";