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* refactor: use DataFusion's UDAF implementation directly Signed-off-by: luofucong <luofc@foxmail.com> * remove: delete how-to guide for writing aggregate functions Signed-off-by: luofucong <luofc@foxmail.com> * fix ci Signed-off-by: luofucong <luofc@foxmail.com> * refactor: port json_encode_path to datafusion udaf Signed-off-by: Ning Sun <sunning@greptime.com> --------- Signed-off-by: luofucong <luofc@foxmail.com> Signed-off-by: Ning Sun <sunning@greptime.com> Co-authored-by: Ning Sun <sunning@greptime.com>