给定以下postgresql的sql脚本。。。

CREATE TABLE IF NOT EXISTS my_table (
    id          UUID PRIMARY KEY,
    name        VARCHAR(255) NOT NULL, 
    create_time TIMESTAMP    NOT NULL DEFAULT CURRENT_TIMESTAMP,
    acl_read    UUID[] DEFAULT array[current_setting('subject')]::uuid[] NOT NULL,
    acl_write   UUID[] DEFAULT array[current_setting('subject')]::uuid[] NOT NULL
);
CREATE INDEX ON my_table USING gin(acl_read);
CREATE INDEX ON my_table USING gin(acl_write);
CREATE POLICY my_table_policy ON my_table
USING (
    acl_read @> array[current_setting('subject')]::uuid[]
    OR
    acl_write @> array[current_setting('subject')]::uuid[]
)
WITH CHECK (
    acl_write @> array[current_setting('subject')]::uuid[]
);
ALTER TABLE my_table ENABLE ROW LEVEL SECURITY;

... 我想搬家 POLICY 节，并传递要为其创建策略的表的名称：

CREATE TABLE IF NOT EXISTS my_table (
    id          UUID PRIMARY KEY,
    name        VARCHAR(255) NOT NULL, 
    create_time TIMESTAMP    NOT NULL DEFAULT CURRENT_TIMESTAMP,
    acl_read    UUID[] DEFAULT array[current_setting('subject')]::uuid[] NOT NULL,
    acl_write   UUID[] DEFAULT array[current_setting('subject')]::uuid[] NOT NULL
);
\i policy.sql 'my_table'

这里是 policy.sql ，应将表的名称作为输入参数：

CREATE INDEX ON PARAM_VALUE USING gin(acl_read);
CREATE INDEX ON PARAM_VALUE USING gin(acl_write);
CREATE POLICY my_table_policy ON PARAM_VALUE
USING (
    acl_read @> array[current_setting('subject')]::uuid[]
    OR
    acl_write @> array[current_setting('subject')]::uuid[]
)
WITH CHECK (
    acl_write @> array[current_setting('subject')]::uuid[]
);
ALTER TABLE PARAM_VALUE ENABLE ROW LEVEL SECURITY;

所以问题是：如何将表名传递给 policy.sql ? 那么如何得到参数的值呢( PARAM_VALUE )在 policy.sql ?