codec(ticdc): wrong serialized value for avro codec when there are multiple decimals with different precision/scale

[zhangyangyu]

What did you do?

Just as title said. You could use TPC-C test to reproduce. For TPC-C customer table, the c_discount value is always out-of-sync for source and sink.

This raises from bug in goavro, see linkedin/goavro#195.

What did you expect to see?

decimals values are same in source and sink.

What did you see instead?

decimals values are different in source and sink.

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

(paste TiDB cluster version here)

Upstream TiKV version (execute tikv-server --version):

(paste TiKV version here)

TiCDC version (execute cdc version):

(paste TiCDC version here)