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https://issues.apache.org/jira/browse/CALCITE-2982?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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pengzhiwei updated CALCITE-2982:
--------------------------------
Summary: SqlItemOperator should throw understandable exception message for
incorrect field type (was: SqlItemOpeator should throw understandable
exception message for incorrect field type)
> SqlItemOperator should throw understandable exception message for incorrect
> field type
> --------------------------------------------------------------------------------------
>
> Key: CALCITE-2982
> URL: https://issues.apache.org/jira/browse/CALCITE-2982
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: pengzhiwei
> Assignee: pengzhiwei
> Priority: Major
> Fix For: 1.20.0
>
>
> In the follow sql:
> {code:java}
> select name[0] from dept
> {code}
> _name_ is a field of _VARCHAR_ type, the follow exception message is thrown
> out:
> {code:java}
> java.lang.AssertionError: VARCHAR
> at
> org.apache.calcite.sql.fun.SqlItemOperator.getChecker(SqlItemOperator.java:109)
> at
> org.apache.calcite.sql.fun.SqlItemOperator.checkOperandTypes(SqlItemOperator.java:91)
> at org.apache.calcite.sql.SqlOperator.validateOperands(SqlOperator.java:432)
> at org.apache.calcite.sql.SqlOperator.deriveType(SqlOperator.java:516)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5607)
> at
> org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5594)
> at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139)
> {code}
> The exception message is hard to understand for user. I think a message like
> "Cannot apply item opeator to VARCHAR type for filed "name" at line xx
> column xx " is more friendly to the user.
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