{"action":"created","comment":{"url":"https://api.github.com/repos/prestodb/presto/pulls/comments/88845964","pull_request_review_id":9399217,"id":88845964,"diff_hunk":"@@ -184,10 +191,25 @@ public static void outputLongDecimal(DecimalType type, BigIntegerAndLongState st\n         }\n     }\n \n-    private static BigDecimal average(BigIntegerAndLongState state, DecimalType type)\n+    @VisibleForTesting\n+    public static BigDecimal average(LongDecimalWithOverflowAndLongState state, DecimalType type)\n     {\n-        BigDecimal sum = new BigDecimal(state.getBigInteger(), type.getScale());\n+        BigDecimal sum = new BigDecimal(Decimals.decodeUnscaledValue(state.getLongDecimal()), type.getScale());\n         BigDecimal count = BigDecimal.valueOf(state.getLong());\n+\n+        if (state.getOverflow() != 0) {\n+            BigInteger overflowMultiplier = TWO.shiftLeft(UNSCALED_DECIMAL_128_SLICE_LENGTH * 8 - 2);\n+            BigInteger overflow = overflowMultiplier.multiply(BigInteger.valueOf(state.getOverflow()));\n+            sum = sum.add(new BigDecimal(overflow));\n+        }\n         return sum.divide(count, type.getScale(), ROUND_HALF_UP);\n     }\n+\n+    private static void accumulateAndUpdateOverflow(Slice unscaledValue, LongDecimalWithOverflowAndLongState state)\n+    {\n+        initializeIfNeeded(state);\n+        Slice sum = state.getLongDecimal();\n+        long overflow = UnscaledDecimal128Arithmetic.addReturnOverflow(sum, unscaledValue, sum);\n+        state.setOverflow(state.getOverflow() + overflow);","path":"presto-main/src/main/java/com/facebook/presto/operator/aggregation/DecimalAverageAggregation.java","position":172,"original_position":172,"commit_id":"8d40a1c77b089e2c495f56918c31567218f69a2f","original_commit_id":"1ad6c9e620f5a0ac9edead431eda2670e9ffc9ed","user":{"login":"pnowojski","id":8957547,"avatar_url":"https://avatars.githubusercontent.com/u/8957547?v=3","gravatar_id":"","url":"https://api.github.com/users/pnowojski","html_url":"https://github.com/pnowojski","followers_url":"https://api.github.com/users/pnowojski/followers","following_url":"https://api.github.com/users/pnowojski/following{/other_user}","gists_url":"https://api.github.com/users/pnowojski/gists{/gist_id}","starred_url":"https://api.github.com/users/pnowojski/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pnowojski/subscriptions","organizations_url":"https://api.github.com/users/pnowojski/orgs","repos_url":"https://api.github.com/users/pnowojski/repos","events_url":"https://api.github.com/users/pnowojski/events{/privacy}","received_events_url":"https://api.github.com/users/pnowojski/received_events","type":"User","site_admin":false},"body":"?\r\n\r\n`MAX_VALUE + MAX_VALUE` doesn't return `MAX_VALUE` and `overflow = 1`. It returns:\r\n\r\n`(MAX_VALUE + MAX_VALUE) % (2^127)` and overflow = `(MAX_VALUE + MAX_VALUE) / (2^127)`. \r\n\r\nWith concrete numbers:\r\n\r\nMAX_VALUE + MAX_VALUE = 99999999999999999999999999999999999999 + 99999999999999999999999999999999999999 = 29858816539530768268312696284115894270 (with overflow = 1)\r\n\r\nthen subtract \r\n- MIN_VALUE -> returns -70141183460469231731687303715884105729L (with overflow 1)\r\n\r\nLook at previous response","created_at":"2016-11-21T08:19:58Z","updated_at":"2016-11-21T08:26:18Z","html_url":"https://github.com/prestodb/presto/pull/6261#discussion_r88845964","pull_request_url":"https://api.github.com/repos/prestodb/presto/pulls/6261","_links":{"self":{"href":"https://api.github.com/repos/prestodb/presto/pulls/comments/88845964"},"html":{"href":"https://github.com/prestodb/presto/pull/6261#discussion_r88845964"},"pull_request":{"href":"https://api.github.com/repos/prestodb/presto/pulls/6261"}}},"pull_request":{"url":"https://api.github.com/repos/prestodb/presto/pulls/6261","id":87853613,"html_url":"https://github.com/prestodb/presto/pull/6261","diff_url":"https://github.com/prestodb/presto/pull/6261.diff","patch_url":"https://github.com/prestodb/presto/pull/6261.patch","issue_url":"https://api.github.com/repos/prestodb/presto/issues/6261","number":6261,"state":"open","locked":false,"title":"Feature fast decimal 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