问Django db错误:尝试使用jsonfield注释模型时，无法识别json类型的相等运算符

EN

-- This creates a function named hashjson that transforms the
-- json to texts and generates a hash
CREATE OR REPLACE FUNCTION hashjson(            
    json          
) RETURNS INTEGER LANGUAGE SQL STRICT IMMUTABLE AS $$ 
    SELECT hashtext($1::text); 
$$; 

-- This creates a function named json_eq that checks equality (as text)
CREATE OR REPLACE FUNCTION json_eq(            
    json, 
    json              
) RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$ 
    SELECT bttextcmp($1::text, $2::text) = 0; 
$$; 

-- This creates an operator from the equality function
CREATE OPERATOR = (            
    LEFTARG   = json, 
    RIGHTARG  = json, 
    PROCEDURE = json_eq 
); 

-- Finaly, this defines a new default JSON operator family with the
-- operators and functions we just defined.
CREATE OPERATOR CLASS json_ops
   DEFAULT FOR TYPE json USING hash AS
   OPERATOR 1  =,
   FUNCTION 1  hashjson(json);

CREATE OR REPLACE FUNCTION json_cmp(left json, right json)
RETURNS integer AS $$
    function cleverType(obj) {
        var type = typeof obj;

        if (type === 'object') {
            if (obj === null) {
                type = 'null';
            } else if (obj instanceof Array) {
                type = 'array';
            }
        }

        return type;
    }

    function cmp(left, right) {
        var leftType = cleverType(left),
            rightType = cleverType(right),
            i,
            buf,
            leftKeys,
            rightKeys,
            output = 0;

        if (leftType !== rightType) {
            output = leftType.localeCompare(rightType);
        } else if (leftType === 'number'
                || leftType === 'boolean'
                || leftType === 'string') {
            if (left < right) {
                output = -1;
            } else if (left > right) {
                output = 1;
            } else {
                output = 0;
            }
        } else if (leftType === 'array') {
            if (left.length !== right.length) {
                output = cmp(left.length, right.length);
            } else {
                for (i = 0; i < left.length; i += 1) {
                    buf = cmp(left[i], right[i]);

                    if (buf !== 0) {
                        output = buf;
                        break;
                    }
                }
            }
        } else if (leftType === 'object') {
            leftKeys = Object.keys(left);
            rightKeys = Object.keys(right);

            if (leftKeys.length !== rightKeys.length) {
                leftKeys.sort();
                rightKeys.sort();
                buf = cmp(leftKeys, rightKeys);
            } else {
                buf = cmp(leftKeys.length, rightKeys.length);
            }

            if (buf !== 0) {
                output = buf;
            } else {
                for (i = 0; i < leftKeys.length; i += 1) {
                    buf = cmp(left[leftKeys[i]], right[leftKeys[i]]);

                    if (buf !== 0) {
                        output = buf;
                        break;
                    }
                }
            }
        }

        return output;
    }

    return cmp(left, right);
$$ LANGUAGE plv8 IMMUTABLE STRICT;

CREATE OR REPLACE FUNCTION json_eq(json, json)
RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$
    SELECT json_cmp($1, $2) = 0;
$$;

CREATE OR REPLACE FUNCTION json_lt(json, json)
RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$
    SELECT json_cmp($1, $2) < 0;
$$;

CREATE OR REPLACE FUNCTION json_lte(json, json)
RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$
    SELECT json_cmp($1, $2) <= 0;
$$;

CREATE OR REPLACE FUNCTION json_gt(json, json)
RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$
    SELECT json_cmp($1, $2) > 0;
$$;

CREATE OR REPLACE FUNCTION json_gte(json, json)
RETURNS BOOLEAN LANGUAGE SQL STRICT IMMUTABLE AS $$
    SELECT json_cmp($1, $2) >= 0;
$$;

CREATE OPERATOR =  (LEFTARG = json, RIGHTARG = json, PROCEDURE = json_eq);
CREATE OPERATOR <  (LEFTARG = json, RIGHTARG = json, PROCEDURE = json_lt);
CREATE OPERATOR <= (LEFTARG = json, RIGHTARG = json, PROCEDURE = json_lte);
CREATE OPERATOR >  (LEFTARG = json, RIGHTARG = json, PROCEDURE = json_gt);
CREATE OPERATOR >= (LEFTARG = json, RIGHTARG = json, PROCEDURE = json_gte);

CREATE OPERATOR CLASS json_ops
   DEFAULT FOR TYPE json USING btree AS
   OPERATOR 1 <,
   OPERATOR 2 <=,
   OPERATOR 3 =,
   OPERATOR 4 >=,
   OPERATOR 5 >,
   FUNCTION 1 json_cmp(json, json);