[ISTHMUS] Add friendly tips for the CLI about using -c option to pass DDL SQL when parsing DML SQL

[yanghua]

For beginners, if a user only parses a DML SQL via isthmus will meet the calcite exception, like this:

org.apache.calcite.runtime.CalciteContextException: From line 1, column 17 to line 1, column 31: Object 'XXX' not found
        at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:480)
        at org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:505)
        at org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:932)
        at org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:917)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(SqlValidatorImpl.java:5266)
        at org.apache.calcite.sql.validate.IdentifierNamespace.resolveImpl(IdentifierNamespace.java:183)
        at org.apache.calcite.sql.validate.IdentifierNamespace.validateImpl(IdentifierNamespace.java:188)
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:89)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1100)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1071)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:3375)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3639)
        at org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:64)
        at org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:89)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1100)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1071)
        at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:247)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:1046)
        at org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:752)
        at org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:586)
        at io.substrait.isthmus.SqlToSubstrait.getBestExpRelRoot(SqlToSubstrait.java:124)
        at io.substrait.isthmus.SqlToSubstrait.lambda$sqlToRelNode$1(SqlToSubstrait.java:103)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
        at java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:720)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
        at io.substrait.isthmus.SqlToSubstrait.sqlToRelNode(SqlToSubstrait.java:104)
        at io.substrait.isthmus.SqlToSubstrait.executeInner(SqlToSubstrait.java:74)
        at io.substrait.isthmus.SqlToSubstrait.execute(SqlToSubstrait.java:43)
        at io.substrait.isthmus.PlanEntryPoint.call(PlanEntryPoint.java:59)
        at io.substrait.isthmus.PlanEntryPoint.call(PlanEntryPoint.java:16)
        at picocli.CommandLine.executeUserObject(CommandLine.java:1953)
        at picocli.CommandLine.access$1300(CommandLine.java:145)
        at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2352)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2346)
        at picocli.CommandLine$RunLast.handle(CommandLine.java:2311)
        at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2179)
        at picocli.CommandLine.execute(CommandLine.java:2078)
        at io.substrait.isthmus.PlanEntryPoint.main(PlanEntryPoint.java:51)
Caused by: org.apache.calcite.sql.validate.SqlValidatorException: Object 'XXX' not found
        at java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:480)
        at org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:505)
        at org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:599)
        ... 40 more

So, IMO, it would be better to give a friendly tip when parsing DML SQL to let the users know it could give the definition via the -c option.

[yanghua]

@jacques-n WDYT?