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Description

We had supported default value with el expression feature in sink-options-placeholders.
eg:
${table_name:default_my_table}

We should support default value with el expression in all config place too. Including env, source, transform, sink.
It's a sub feature of config-variable-substitution. So the el expression with default value will be replaced with user configure value when use shell script with -i.

The flow diagram:

Usage Scenario

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