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https://issues.apache.org/jira/browse/FLINK-18938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181156#comment-17181156
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liufangliang commented on FLINK-18938:
--------------------------------------
[~jark] I understand what you mean.
when we are quering a sink-only connector ,
if we don't have a dependency jar in the classpath ,return the following
excception message:
{code:java}
Caused by: org.apache.flink.table.api.ValidationException: Could not find any
factory for identifier 'elasticsearch-7' that implements
'org.apache.flink.table.factories.DynamicTableSourceFactory' in the classpath.
{code}
if we have a dependency jar in the classpath ,return the following excception
message:
{code:java}
Caused by: org.apache.flink.table.api.ValidationException: The connector named
'elasticsearch-7' is only supported as sink,can n't be used as a source.
{code}
Bisides,Tips（support as sink or source） can follow the identifier,For example:
{code:java}
Available factory identifiers are:
datagen (source,sink)
elasticsearch-7 (sink-only)
test-connector (source-only)
{code}
What do you think of ?
> Throw better exception message for quering sink-only connector
> --------------------------------------------------------------
>
> Key: FLINK-18938
> URL: https://issues.apache.org/jira/browse/FLINK-18938
> Project: Flink
> Issue Type: Improvement
> Reporter: Jark Wu
> Priority: Major
>
> Currently, if we are quering a sink-only connector, for example: {{SELECT *
> FROM elasticsearch_sink}}, a following exception will be thrown:
> {code}
> Caused by: org.apache.flink.table.api.ValidationException: Could not find any
> factory for identifier 'elasticsearch-7' that implements
> 'org.apache.flink.table.factories.DynamicTableSourceFactory' in the classpath.
> Available factory identifiers are:
> datagen
> {code}
> The above exception is very misleading, it sounds like that the elasticsearch
> jar is not loaded, however the elasticsearch jar is in the lib directory of
> Flink cluster.
> We can improve the exception that explicitly telling users the found
> connector only support as sink, can't be used as a source.
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