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java.lang.NullPointerException: 	at org.hsqldb.ExpressionLike.resolveTypes(ExpressionLike.java:175)	at org.hsqldb.QuerySpecification.resolveExpressionTypes(QuerySpecification.java:966)	at org.hsqldb.QuerySpecification.resolveTypesPartOne(QuerySpecification.java:349)	at org.hsqldb.QueryExpression.resolve(QueryExpression.java:227)	at org.hsqldb.ParserDQL.compileCursorSpecification(ParserDQL.java:6265)	at org.hsqldb.ParserCommand.compilePart(ParserCommand.java:147)	at org.hsqldb.ParserCommand.compileStatement(ParserCommand.java:64)	at org.hsqldb.Session.compileStatement(Session.java:923)	at org.hsqldb.StatementManager.compile(StatementManager.java:375)	at org.hsqldb.Session.execute(Session.java:1027)	at org.hsqldb.jdbc.JDBCPreparedStatement.(JDBCPreparedStatement.java:3885)	at org.hsqldb.jdbc.JDBCConnection.prepareStatement(JDBCConnection.java:641)	at TestDB.testLikeWithEscape(TestDB.java:29)	at TestDB.main(TestDB.java:17)