Github user lomoree commented on a diff in the pull request: https://github.com/apache/phoenix/pull/212#discussion_r81216671 --- Diff: phoenix-core/src/main/java/org/apache/phoenix/calcite/CalciteUtils.java --- @@ -1036,4 +1048,40 @@ public Void visitCall(RexCall call) { return null; } } + + public static Object convertLiteral(SqlLiteral literal, PhoenixRelImplementor implementor) { + try { + final SchemaPlus rootSchema = Frameworks.createRootSchema(true); + final FrameworkConfig config = Frameworks.newConfigBuilder() + .parserConfig(SqlParser.Config.DEFAULT) + .defaultSchema(rootSchema).build(); + Planner planner = Frameworks.getPlanner(config); + + SqlParserPos POS = SqlParserPos.ZERO; + final SqlNodeList selectList = + new SqlNodeList( + Collections.singletonList(literal), + SqlParserPos.ZERO); + + + String sql = new SqlSelect(POS, SqlNodeList.EMPTY, selectList, null, null, null, null, + SqlNodeList.EMPTY, null, null, null).toString(); + SqlNode sqlNode = planner.parse(sql); + sqlNode = planner.validate(sqlNode); + Project proj = (Project) (planner.rel(sqlNode).rel); + RexNode rex = proj.getChildExps().get(0); + + Expression e = CalciteUtils.toExpression(rex, implementor); + ImmutableBytesWritable ptr = new ImmutableBytesWritable(); + e = ExpressionUtil.getConstantExpression(e, ptr); + Object ret = e.getDataType().toObject(ptr); + if(ret instanceof NlsString){ --- End diff -- Yes I meant that as well. I think it's because we had originally intended to use Calcite utilities to do this. I just ran through a debugger and all inputs parse down to either a Char or a String. It is definitely covered by test cases.
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