Yesheng Ma created SPARK-27908:
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Summary: Improve parser error message for SELECT TOP statement
Key: SPARK-27908
URL: https://issues.apache.org/jira/browse/SPARK-27908
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 3.0.0
Reporter: Yesheng Ma
The {{SELECT TOP}} statement is actually not supported in Spark SQL. However,
when a user queries such a statement, the error message is confusing. For
example, the error message for
{code:sql}
SELECT TOP 1 FROM test;
{code}
is
{code:java}
Error in query:
mismatched input '1' expecting {<EOF>, '(', ',', '.', '[', 'ADD', 'AFTER',
'ALL', 'ALTER', 'ANALYZE', 'AND', 'ANTI', 'ANY', 'ARCHIVE', 'ARRAY', 'AS',
'ASC', 'AT', 'AUTHORIZATION', 'BETWEEN', 'BOTH', 'BUCKET', 'BUCKETS', 'BY',
'CACHE', 'CASCADE', 'CASE', 'CAST', 'CHANGE', 'CHECK', 'CLEAR', 'CLUSTER',
'CLUSTERED', 'CODEGEN', 'COLLATE', 'COLLECTION', 'COLUMN', 'COLUMNS',
'COMMENT', 'COMMIT', 'COMPACT', 'COMPACTIONS', 'COMPUTE', 'CONCATENATE',
'CONSTRAINT', 'COST', 'CREATE', 'CROSS', 'CUBE', 'CURRENT', 'CURRENT_DATE',
'CURRENT_TIME', 'CURRENT_TIMESTAMP', 'CURRENT_USER', 'DATA', 'DATABASE',
DATABASES, 'DAY', 'DAYS', 'DBPROPERTIES', 'DEFINED', 'DELETE', 'DELIMITED',
'DESC', 'DESCRIBE', 'DFS', 'DIRECTORIES', 'DIRECTORY', 'DISTINCT',
'DISTRIBUTE', 'DROP', 'ELSE', 'END', 'ESCAPED', 'EXCEPT', 'EXCHANGE', 'EXISTS',
'EXPLAIN', 'EXPORT', 'EXTENDED', 'EXTERNAL', 'EXTRACT', 'FALSE', 'FETCH',
'FIELDS', 'FILEFORMAT', 'FIRST', 'FOLLOWING', 'FOR', 'FOREIGN', 'FORMAT',
'FORMATTED', 'FROM', 'FULL', 'FUNCTION', 'FUNCTIONS', 'GLOBAL', 'GRANT',
'GROUP', 'GROUPING', 'HAVING', 'HOUR', 'HOURS', 'IF', 'IGNORE', 'IMPORT', 'IN',
'INDEX', 'INDEXES', 'INNER', 'INPATH', 'INPUTFORMAT', 'INSERT', 'INTERSECT',
'INTERVAL', 'INTO', 'IS', 'ITEMS', 'JOIN', 'KEYS', 'LAST', 'LATERAL', 'LAZY',
'LEADING', 'LEFT', 'LIKE', 'LIMIT', 'LINES', 'LIST', 'LOAD', 'LOCAL',
'LOCATION', 'LOCK', 'LOCKS', 'LOGICAL', 'MACRO', 'MAP', 'MICROSECOND',
'MICROSECONDS', 'MILLISECOND', 'MILLISECONDS', 'MINUTE', 'MINUTES', 'MONTH',
'MONTHS', 'MSCK', 'NATURAL', 'NO', NOT, 'NULL', 'NULLS', 'OF', 'ON', 'ONLY',
'OPTION', 'OPTIONS', 'OR', 'ORDER', 'OUT', 'OUTER', 'OUTPUTFORMAT', 'OVER',
'OVERLAPS', 'OVERWRITE', 'PARTITION', 'PARTITIONED', 'PARTITIONS', 'PERCENT',
'PIVOT', 'POSITION', 'PRECEDING', 'PRIMARY', 'PRINCIPALS', 'PURGE', 'QUERY',
'RANGE', 'RECORDREADER', 'RECORDWRITER', 'RECOVER', 'REDUCE', 'REFERENCES',
'REFRESH', 'RENAME', 'REPAIR', 'REPLACE', 'RESET', 'RESTRICT', 'REVOKE',
'RIGHT', RLIKE, 'ROLE', 'ROLES', 'ROLLBACK', 'ROLLUP', 'ROW', 'ROWS', 'SCHEMA',
'SECOND', 'SECONDS', 'SELECT', 'SEMI', 'SEPARATED', 'SERDE', 'SERDEPROPERTIES',
'SESSION_USER', 'SET', 'MINUS', 'SETS', 'SHOW', 'SKEWED', 'SOME', 'SORT',
'SORTED', 'START', 'STATISTICS', 'STORED', 'STRATIFY', 'STRUCT', 'TABLE',
'TABLES', 'TABLESAMPLE', 'TBLPROPERTIES', TEMPORARY, 'TERMINATED', 'THEN',
'TO', 'TOUCH', 'TRAILING', 'TRANSACTION', 'TRANSACTIONS', 'TRANSFORM', 'TRUE',
'TRUNCATE', 'UNARCHIVE', 'UNBOUNDED', 'UNCACHE', 'UNION', 'UNIQUE', 'UNLOCK',
'UNSET', 'USE', 'USER', 'USING', 'VALUES', 'VIEW', 'WEEK', 'WEEKS', 'WHEN',
'WHERE', 'WINDOW', 'WITH', 'YEAR', 'YEARS', EQ, '<=>', '<>', '!=', '<', LTE,
'>', GTE, '+', '-', '*', '/', '%', 'DIV', '&', '|', '||', '^', IDENTIFIER,
BACKQUOTED_IDENTIFIER}(line 1, pos 11)
== SQL ==
SELECT TOP 1 FROM test
-----------^^^
{code}
which is verbose and misleading.
One possible way to fix is to explicitly capture these statements in a grammar
rule and print user-friendly error message such as
{code:java}
SELECT TOP statements are not supported.
{code}
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