Support parse UUID without separator#11856
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alexey-milovidov merged 5 commits intoClickHouse:masterfrom Jun 25, 2020
Merged
Support parse UUID without separator#11856alexey-milovidov merged 5 commits intoClickHouse:masterfrom
alexey-milovidov merged 5 commits intoClickHouse:masterfrom
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zhang2014
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src/IO/ReadHelpers.h
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| @@ -577,13 +636,18 @@ inline void readUUIDText(UUID & uuid, ReadBuffer & buf) | |||
| char s[36]; | |||
| size_t size = buf.read(s, 36); | |||
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But how we will continue to read next data from buffer if we already read extra bytes?
src/IO/ReadHelpers.h
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| size_t dst_pos = 0; | ||
| for (; dst_pos < num_bytes; ++dst_pos) | ||
| { | ||
| dst[dst_pos] = UInt8(unhex(src[src_pos])) * 16 + UInt8(unhex(src[src_pos + 1])); |
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The unhex2 function is exactly for this purpose.
src/IO/ReadHelpers.h
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| } | ||
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| template <bool with_separator> | ||
| void parseUUID(const UInt8 * src36, UInt8 * dst16) |
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This template is always used with explicit parameter. And it is implemented with two separate branches...
So, we can simply make two functions:
parseUUID
parseUUIDWithoutSeparator
src/IO/ReadHelpers.h
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| } | ||
| else | ||
| { | ||
| parseHex(&src36[0], &dst16[0], 4); |
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Why don't parse it all with one call of parseHex?
zhang2014
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Better to add examples to docs about UUID |
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Support parse UUID without separator(separators are always removed in most implementations, this is helpful for users to write data)