expression: simplify get priority by collation (#18783)
expression: simplify get priority by collation (#18783)


EvilMcJerkface/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,pingcap/tidb,coocood/tidb,c4pt0r/tidb,pingcap/tidb,XuHuaiyu/tidb,kyle-wang/tidb,ngaut/tidb,coocood/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,ngaut/tidb,XuHuaiyu/tidb,pingcap/tidb