Github user jinfengni commented on a diff in the pull request: https://github.com/apache/drill/pull/685#discussion_r97449967 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/ContextFunctions.java --- @@ -64,17 +65,45 @@ public void eval() { @Inject DrillBuf buffer; @Workspace int currentSchemaBytesLength; + @Override public void setup() { final byte[] currentSchemaBytes = contextInfo.getCurrentDefaultSchema().getBytes(); buffer = buffer.reallocIfNeeded(currentSchemaBytes.length); currentSchemaBytesLength= currentSchemaBytes.length; buffer.setBytes(0, currentSchemaBytes); } + @Override public void eval() { out.start = 0; out.end = currentSchemaBytesLength; out.buffer = buffer; } } + + /** + * Implement "session_id" function. Returns the unique id of the current session. + */ + @FunctionTemplate(name = "session_id", scope = FunctionTemplate.FunctionScope.SIMPLE, isNiladic = true) --- End diff -- I thought this new introduced flag "isNiladic" should not only applied to this new "session_id" function, but also for all the existing functions which falls into same category, for example, current_date /current_time? 1. https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/DateTypeFunctions.java#L234 2. https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/DateTypeFunctions.java#L290
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