Github user nagarajanchinnasamy commented on a diff in the pull request: https://github.com/apache/drill/pull/685#discussion_r93128266 --- 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) + public static class SessionId implements DrillSimpleFunc { + @Output VarCharHolder out; + @Inject ContextInformation contextInfo; + @Inject DrillBuf buffer; + @Workspace int sessionIdBytesLength; + + @Override + public void setup() { + final byte[] sessionIdBytes = contextInfo.getSessionId().getBytes(); + buffer = buffer.reallocIfNeeded(sessionIdBytes.length); + sessionIdBytesLength = sessionIdBytes.length; + buffer.setBytes(0, sessionIdBytes); + } + + @Override + public void eval() { + out.start = 0; + out.end = sessionIdBytesLength; + out.buffer = buffer; + } + } } --- End diff -- Invocation of `session_id()` without parenthesis is pending
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