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https://issues.apache.org/jira/browse/DRILL-5136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925492#comment-15925492
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Laurent Goujon commented on DRILL-5136:
---------------------------------------
I might not be the best person to answer this issue unfortunately, as I don't
know in details how SQL parsing is done in Drill, if there's a way to identify
the type of queries submitted to the engine. My guess is that depending on the
type of queries, one could return a predetermined schema vs running a limit 0
query if schema has to be discovered. Maybe this could be an extension of each
SQLHandler?
> Some SQL statements fail due to PreparedStatement
> -------------------------------------------------
>
> Key: DRILL-5136
> URL: https://issues.apache.org/jira/browse/DRILL-5136
> Project: Apache Drill
> Issue Type: Bug
> Components: Client - ODBC
> Affects Versions: 1.9.0
> Reporter: Robert Hou
> Assignee: Laurent Goujon
>
> "show schemas" does not work.
> SQL>show schemas
> 1: SQLPrepare = [MapR][Drill] (1040) Drill failed to execute the query: show
> schemas
> [30029]Query execution error. Details:[
> PARSE ERROR: Encountered "( show" at line 1, column 15.
> Was expecting one of:
> <IDENTIFIER> ...
> <QUOTED_IDENTIFIER> ...
> <BACK_QUOTED_IDENTIFIER> ...
> <BRACKET_QUOTED_IDENTIFIER> ...
> <UNICODE_QUOTED_IDENTIFIER> ...
> "LATERAL" ...
> "(" "WITH" ...
> "(" "+" ...
> "(" "-" ...
> "(" <UNSIGNED_INTEGER_LITERAL> ...
> "(" <DECIMAL_NUMERIC_LITERAL> ...
> "(" <APPROX_NUMERIC (1040) SQLSTATE=HY000
> The query profile shows this SQL statement is being executed:
> {color:blue} SELECT * FROM {color} (show schemas) {color:blue} LIMIT 0
> {color}
>
> The blue text has been added when displaying schemas
> "use schema" also does not work.
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