Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/819#discussion_r113605799
--- Diff: common/src/main/java/org/apache/drill/common/types/Types.java ---
@@ -340,18 +344,18 @@ public static int getJdbcDisplaySize(MajorType type) {
case INTERVALYEAR:
return precision > 0
? 5 + precision // P..Y12M
- : 0; // if precision is not set, return 0 because there's not
enough info
+ : UNDEFINED; // if precision is not set, return 0 because
there's not enough info
case INTERVALDAY:
return precision > 0
? 12 + precision // P..DT12H60M60S assuming fractional seconds
precision is not supported
- : 0; // if precision is not set, return 0 because there's not
enough info
+ : UNDEFINED; // if precision is not set, return 0 because
there's not enough info
--- End diff --
We know that an interval of days must fit into a 12-byte field. I think the
encoding is 4 bytes for days, 8 for ms. So, maximum width can be computed from
that.
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