remove code that's in the arrow library now (#3206)

Author: kmitchener

datafusion/core/tests/sql/mod.rs

@@ -887,21 +887,6 @@ fn col_str(column: &ArrayRef, row_index: usize) -> String {
         return "NULL".to_string();
     }
 
-    // Special case ListArray as there is no pretty print support for it yet
-    if let DataType::FixedSizeList(_, n) = column.data_type() {
-        let array = column
-            .as_any()
-            .downcast_ref::<FixedSizeListArray>()
-            .unwrap()
-            .value(row_index);
-
-        let mut r = Vec::with_capacity(*n as usize);
-        for i in 0..*n {
-            r.push(col_str(&array, i as usize));
-        }
-        return format!("[{}]", r.join(","));
-    }
-
     array_value_to_string(column, row_index)
         .ok()
         .unwrap_or_else(|| "???".to_string())