Xiao Huang created FLINK-36970:
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Summary: Merge result of data type BIGINT and DOUBLE should be
DOUBLE instead of STRING
Key: FLINK-36970
URL: https://issues.apache.org/jira/browse/FLINK-36970
Project: Flink
Issue Type: Improvement
Components: Flink CDC
Reporter: Xiao Huang
In SchemaMergingUtils#getLeastCommonType, the merge result of BIGINT and DOUBLE
is STRING now.
However, considering JSON string, JSON number can be integers or floating
point. Data type of integers can be inferred as BIGINT, and floating point can
be inferred as DOUBLE. So a JSON number field will be inferred as STRING, which
is confusing.
The merge result of numerical types should always be a numerical type.
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