consider table level max_rows directive in builder

Author: kafaichoi

src/builder.rs

@@ -1423,13 +1423,13 @@ where
                 }
             };
 
-            let max_rows: u64 = xtype
+            let max_rows = xtype
                 .schema
                 .context
                 .schemas
                 .values()
                 .find(|s| s.oid == xtype.table.schema_oid)
-                .map(|x| x.directives.max_rows)
+                .map(|schema| xtype.table.max_rows(schema))
                 .unwrap_or(30);
 
             let before: Option<Cursor> = read_argument_cursor(

src/sql_types.rs

@@ -591,7 +591,7 @@ impl Table {
     /// Get the effective max_rows value for this table.
     /// If table-specific max_rows is set, use that.
     /// Otherwise, fall back to schema-level max_rows.
-    /// If neither is set, use the global default.
+    /// If neither is set, use the global default(set in load_sql_context.sql)
     pub fn max_rows(&self, schema: &Schema) -> u64 {
         self.directives.max_rows.unwrap_or(schema.directives.max_rows)
     }