priyen opened a new issue, #8992:
URL: https://github.com/apache/pinot/issues/8992

   Given a query as follows:
   ```
   select
     cast(
       date_trunc(
         'day',
         datetime_convert(
           datetime_convert(
             date_timestamp + FromEpochDays(case when 'week' = 'week'  then 1 
else 0 end),
             '1:MILLISECONDS:EPOCH',
             '1:MILLISECONDS:SIMPLE_DATE_FORMAT:yyyy-MM-dd tz(UTC)',
             '1:MILLISECONDS'
             ),.........
   ```
   this throws with exception 
   ```
   ProcessingException(errorCode:150, message:SQLParsingError:
   org.apache.pinot.sql.parsers.SqlCompilationException: Caught exception while 
invoking method: public static boolean 
org.apache.pinot.common.function.scalar.ComparisonFunctions.equals(double,double)
 with arguments: [week, week]
        at 
org.apache.pinot.sql.parsers.rewriter.CompileTimeFunctionsInvoker.invokeCompileTimeFunctionExpression(CompileTimeFunctionsInvoker.java:87)
        at 
org.apache.pinot.sql.parsers.rewriter.CompileTimeFunctionsInvoker.invokeCompileTimeFunctionExpression(CompileTimeFunctionsInvoker.java:65)
        at 
org.apache.pinot.sql.parsers.rewriter.CompileTimeFunctionsInvoker.invokeCompileTimeFunctionExpression(CompileTimeFunctionsInvoker.java:65)
        at 
org.apache.pinot.sql.parsers.rewriter.CompileTimeFunctionsInvoker.invokeCompileTimeFunctionExpression(CompileTimeFunctionsInvoker.java:65)
   ...
   Caused by: java.lang.NumberFormatException: For input string: "week"
        at 
java.base/jdk.internal.math.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2054)
        at 
java.base/jdk.internal.math.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
        at java.base/java.lang.Double.parseDouble(Double.java:543)
        at 
org.apache.pinot.common.utils.PinotDataType$11.toDouble(PinotDataType.java:621))
   ```
   
   -- 
   Previously this worked fine in an older version of Pinot, if you change the 
'week' = 'week' to 2 = 2, it works, so something is wrong with the literal 
parsing.  This is inside a case statement, so string comparison should be 
supported. 


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