# GAUSS-01441 -- GAUSS-01450 错误码
GAUSS-01441: "btree comparison procedures must have two arguments"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是btree且指定的函数是btree比较函数，但是参数个数不是2个。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，指定的函数是btree比较函数，则参数个数必须是2个。
GAUSS-01442: "btree comparison procedures must return integer"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是btree且指定的函数是btree比较函数，但是返回值类型不是int。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，指定的函数是btree比较函数，则返回值类型必须是int。
GAUSS-01443: "btree sort support procedures must accept type 'internal'"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是btree且指定的函数是btree sort support函数，但是参数类型不是internal。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，指定的函数是btree sort support函数，则参数类型必须是internal。
GAUSS-01444: "btree sort support procedures must return void"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是btree且指定的函数是btree sort support函数，但是返回值类型不是void。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，指定的函数是btree sort support函数，则返回值类型必须是void。
GAUSS-01445: "hash procedures must have one argument"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是hash，但是参数个数不是1个。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是hash，则参数个数必须是1个。
GAUSS-01446: "hash procedures must return integer"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是hash，但是返回值类型不是int。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD FUNCTION，access_method是hash，则返回值类型必须是int。
GAUSS-01447: "associated data types must be specified for index support procedure"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS没有指定合法的FOR TYPE data_type，ALTER OPERATOR FAMILY ... ADD OPERATOR没有指定左或右参数类型。
解决办法：CREATE OPERATOR CLASS必须指定合法的FOR TYPE data_type，ALTER OPERATOR FAMILY ... ADD OPERATOR必须指定左参数类型或者右参数类型。
GAUSS-01448: "procedure number %d for (%s,%s) appears more than once"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP procedure，相同的函数出现了多次。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP procedure，确保一个SQL语句中不要出现重复函数。
GAUSS-01449: "operator number %d for (%s,%s) appears more than once"
SQLSTATE: 42P17
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP operator，相同的操作符出现了多次。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP operator，确保一个SQL语句中不要出现重复的操作符。
GAUSS-01450: "operator %d(%s,%s) already exists in operator family '%s'"
SQLSTATE: 42710
错误原因：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP operator，已经存在了相同的operator。
解决办法：CREATE OPERATOR CLASS、ALTER OPERATOR FAMILY ... ADD/DROP operator之前，确保添加的operator在指定的operator family中尚未存在。