Ian Bertolacci created CALCITE-5273:
---------------------------------------
Summary: RelToSqlConverter allows unparsing of invalid CASE
expression
Key: CALCITE-5273
URL: https://issues.apache.org/jira/browse/CALCITE-5273
Project: Calcite
Issue Type: Bug
Reporter: Ian Bertolacci
RelToSqlConverter will unparse the invalid† CASE expression {{`CASE ELSE 1
END`}} (which can be constructed using either RelBuilder or RexBuilder, see
CALCITE-5272).
(† Or at least and expression which Calcite then cannot parse.)
Given this RelNode tree with invalid case statements
{code}
1:LogicalProject($f0=[CASE(1)], $f1=[CASE(1:BIGINT)])
0:LogicalValues(tuples=[[{ 0 }]])
{code}
Unparsing with RelToSqlConverter using MysqlSqlDialect.DEFAULT‡ gives the Sql:
{code}
SELECT CASE ELSE 1 END AS `$f0`, CASE ELSE 1 END AS `$f1`
{code}
Running that sql back through the parser using Lex.MYSQL‡ and
SqlConformanceEnum.MYSQL_5‡ throws the exception:
{code}
Incorrect syntax near the keyword 'CASE' at line 1, column 8.
Was expecting one of:
"ALL" ...
"CURSOR" ...
"DISTINCT" ...
...
org.apache.calcite.sql.parser.SqlParseException: Incorrect syntax near the
keyword 'CASE' at line 1, column 8.
Was expecting one of:
"ALL" ...
"CURSOR" ...
"DISTINCT" ...
...
at
org.apache.calcite.sql.parser.impl.SqlParserImpl.convertException(SqlParserImpl.java:389)
at
org.apache.calcite.sql.parser.impl.SqlParserImpl.normalizeException(SqlParserImpl.java:153)
at
org.apache.calcite.sql.parser.SqlParser.handleException(SqlParser.java:145)
at
org.apache.calcite.sql.parser.SqlParser.parseQuery(SqlParser.java:160)
at org.apache.calcite.sql.parser.SqlParser.parseStmt(SqlParser.java:185)
at org.apache.calcite.prepare.PlannerImpl.parse(PlannerImpl.java:214)
at org.apache.calcite.tools.Planner.parse(Planner.java:50)
..
Caused by: org.apache.calcite.sql.parser.impl.ParseException: Incorrect syntax
near the keyword 'CASE' at line 1, column 8.
Was expecting one of:
"ALL" ...
"CURSOR" ...
"DISTINCT" ...
...
at
org.apache.calcite.sql.parser.impl.SqlParserImpl.convertException(SqlParserImpl.java:349)
... 59 more
{code}
‡ I don't believe the specific dialect/lex/conformance parameters affect the
outcome.
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