pub fn parse_copy_from_stdin_head(sql: &str) -> Option<CopyFromSpec>Expand description
Parse the head of a COPY <table> [(cols)] FROM stdin statement
(text format). Returns None when the statement is not that
shape — including COPY … TO stdout and file endpoints. A
trailing WITH (…) options tail is accepted and ignored except
that a non-text FORMAT makes this return None (the embed
path only lowers the text format; callers surface a clear
error).