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https://issues.apache.org/jira/browse/SOLR-15570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390625#comment-17390625
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ASF subversion and git services commented on SOLR-15570:
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Commit 6056b6814de1a93cfbf14858bfa5e6026e86d16d in solr's branch
refs/heads/main from Timothy Potter
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=6056b68 ]
SOLR-15570: Include declared but unused fields from the schema in table
metadata (#241)
> JDBC table metadata should include fields declared in the schema (not
> dynamic) even if they are empty in the index
> ------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-15570
> URL: https://issues.apache.org/jira/browse/SOLR-15570
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Parallel SQL
> Reporter: Timothy Potter
> Assignee: Timothy Potter
> Priority: Minor
> Labels: RobustSQL
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Let's say I have field {{stringx}} declared in my schema but is empty (no
> docs in the index yet).
> Currently, the {{SolrSchema}} uses Luke to generate the table metadata and
> since {{stringx}} is empty, it's not included in the table metadata.
> {code}
> select id, stringx from collection
> {code}
> will fail with:
> {code}
> Error while executing SQL "SELECT id, stringx FROM collection1": From line 1,
> column 12 to line 1, column 18: Column 'stringx' not found in any table
> at
> org.apache.solr.client.solrj.io.stream.JDBCStream.open(JDBCStream.java:286)
> at
> org.apache.solr.client.solrj.io.stream.ExceptionStream.open(ExceptionStream.java:52)
> {code}
> Of course, if an application uses JDBC and {{describe table}} then they won't
> see {{stringx}} so no harm no foul. However, some apps / users may know that
> {{stringx}} is a field in the schema, leading to some mismatch in
> expectations and results.
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