williamhyun opened a new pull request #672:
URL: https://github.com/apache/orc/pull/672
### What changes were proposed in this pull request?
This PR aims to fix regression on column names with a dot character.
### Why are the changes needed?
Since ORC-696, we can not read the orc files with column names including a
dot. For example, the following test file was read incorrectly.
```
% orc-tools meta core/src/test/resources/col.dot.orc
Processing data file core/src/test/resources/col.dot.orc [length: 235]
Structure for core/src/test/resources/col.dot.orc
File Version: 0.12 with ORC_517
Rows: 1
Compression: SNAPPY
Compression size: 262144
Calendar: Julian/Gregorian
Type: struct<`col.dot`:bigint>
Stripe Statistics:
Stripe 1:
Column 0: count: 1 hasNull: false
Column 1: count: 1 hasNull: false bytesOnDisk: 6 min: 0 max: 0 sum: 0
File Statistics:
Column 0: count: 1 hasNull: false
Column 1: count: 1 hasNull: false bytesOnDisk: 6 min: 0 max: 0 sum: 0
Stripes:
Stripe: offset: 3 data: 6 rows: 1 tail: 35 index: 35
Stream: column 0 section ROW_INDEX start: 3 length 11
Stream: column 1 section ROW_INDEX start: 14 length 24
Stream: column 1 section DATA start: 38 length 6
Encoding column 0: DIRECT
Encoding column 1: DIRECT_V2
File length: 235 bytes
Padding length: 0 bytes
Padding ratio: 0%
User Metadata:
org.apache.spark.version=3.1.1
________________________________________________________________________________________________________________________
```
### How was this patch tested?
Pass the CIs with the newly added test case.
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