[flink] Add new type_mapping options to ignore some type changes when spcified #4921
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Purpose
Linked issue: close #4783
We use ticdc to collect data from tidb to kafka, but it does not provide specific parameters for types. No length for varcahr, and no precision and scale for decimal. The current schema evoluation would improve them to string and decimal(38, 18), which is not expected.
So we want to keep the type specified manually unchanged. This could be controlled by the new type_mapping options. NO_CHNAGE, DECIMAL_NO_CHANGE.
Tests
Observe the varchar and decimal field definition after new value ingested.
API and Format
No.
Documentation
Yes and provided