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Miscellaneous
Component | Supported | Notes and limitations |
|---|---|---|
Information schema | ✅ | |
Views | ✅ | |
Window functions | 🟠 | |
Common table expressions (CTEs) | ✅ | |
Stored procedures | 🟠 | |
Cursors | ✅ | |
Triggers | ✅ | |
Some MySQL features are client features, not server features. Dolt ships with a client (ie.
dolt sql) and a server (dolt sql-server). The Dolt client is not as sophisticated as the mysql client. To access these features you can use the mysql client that ships with MySQL.Feature | Supported | Notes and limitations |
|---|---|---|
SOURCE | ❌ | Works with Dolt via the mysql client |
LOAD DATA LOCAL INFILE | ❌ | LOAD DATA INFILE works with the Dolt client. The LOCAL option only works with Dolt via the mysql client |
Dolt supports the following join hints:
name | supported | detail |
|---|---|---|
JOIN_ORDER(,...) | ✅ | Join tree in scope should use the following join execution order. Must include all table names. |
LOOKUP_JOIN(,) | ✅ | Use LOOKUP strategy joining two tables. |
MERGE_JOIN(,) | ✅ | Use MERGE strategy joining two tables. |
HASH_JOIN(,) | ✅ | Use HASH strategy joining two tables. |
INNER_JOIN(,) | ✅ | Use INNER strategy joining two tables. |
SEMI_JOIN(,) | ✅ | Use SEMI strategy joining two tables (for EXISTS or IN queries). |
ANTI_JOIN(,) | ✅ | Use ANTI strategy joining two tables (for NOT EXISTS or NOT IN queries). |
JOIN_FIXED_ORDER | ❌ | Join tree uses in-place table order for execution. |
NO_ICP | ❌ | Disable indexed range scans on index using filters. |
Join hints are indicated immediately after a
SELECT token in a special comment format /*+ */. Multiple hints should be separated by spaces:SELECT /*+ JOIN_ORDER(arg1,arg2) */ 1
SELECT /*+ JOIN_ORDER(arg1,arg2) NO_ICP */ 1
Join hints currently require a full set of valid hints for all to be applied. For example, if we have a three table join we can enforce JOIN_ORDER on its own, join strategies on their own, or both order and strategy:
SELECT /*+ JOIN_ORDER(xy,uv,ab) LOOKUP_JOIN(xy,uv) HASH_JOIN(uv,ab) */ 1
FROM xy
JOIN uv on x = u
JOIN ab on a = u;
Additional notes:
- If one hint is invalid given the execution options, no hints are applied and the engine falls back to default costing.
- Join operator hints are order-insensitive
- Join operator hints apply as long as the indicated tables are subsets of the join left/right.
Dolt supports a subset of the character sets and collations that MySQL supports. Notably, the default character set is
utf8mb4, while the default collation is utf8mb4_0900_bin (a case-sensitive collation). This default was chosen as it has the fastest implementation, and also from a legacy perspective, as before proper collation support was added, it was the only real collation that we supported. This differs from a standard MySQL instance, which defaults to utf8mb4_0900_ai_ci (a case-insensitive collation). Character sets and collations are added upon request, so please file an issue if a character set or collation that you need is missing.Collation | Character Set | Supported |
|---|---|---|
armscii8_bin | armscii8 | ❌ |
armscii8_general_ci | armscii8 | ❌ |
ascii_bin | ascii | ✅ |
ascii_general_ci | ascii | ✅ |
big5_bin | big5 | ❌ |
big5_chinese_ci | big5 | ❌ |
binary | binary | ✅ |
cp1250_bin | cp1250 | ❌ |
cp1250_croatian_ci | cp1250 | ❌ |
cp1250_czech_cs | cp1250 | ❌ |
cp1250_general_ci | cp1250 | ❌ |
cp1250_polish_ci | cp1250 | ❌ |
cp1251_bin | cp1251 | ❌ |
cp1251_bulgarian_ci | cp1251 | ❌ |
cp1251_general_ci | cp1251 | ❌ |
cp1251_general_cs | cp1251 | ❌ |
cp1251_ukrainian_ci | cp1251 | ❌ |
cp1256_bin | cp1256 | ✅ |
cp1256_general_ci | cp1256 | ✅ |
cp1257_bin | cp1257 | ✅ |
cp1257_general_ci | cp1257 | ✅ |
cp1257_lithuanian_ci | cp1257 | ✅ |
cp850_bin | cp850 | ❌ |
cp850_general_ci | cp850 | ❌ |
cp852_bin | cp852 | ❌ |
cp852_general_ci | cp852 | ❌ |
cp866_bin | cp866 | ❌ |
cp866_general_ci | cp866 | ❌ |
cp932_bin | cp932 | ❌ |
cp932_japanese_ci | cp932 | ❌ |
dec8_bin | dec8 | ✅ |
dec8_swedish_ci | dec8 | ✅ |
eucjpms_bin | eucjpms | ❌ |
eucjpms_japanese_ci | eucjpms | ❌ |
euckr_bin | euckr | ❌ |
euckr_korean_ci | euckr | ❌ |
gb18030_bin | gb18030 | ❌ |
gb18030_chinese_ci | gb18030 | ❌ |
gb18030_unicode_520_ci | gb18030 | ❌ |
gb2312_bin | gb2312 | ❌ |
gb2312_chinese_ci | gb2312 | ❌ |
gbk_bin | gbk | ❌ |
gbk_chinese_ci | gbk | ❌ |
geostd8_bin | geostd8 | ✅ |
geostd8_general_ci | geostd8 | ✅ |
greek_bin | greek | ❌ |
greek_general_ci | greek | ❌ |
hebrew_bin | hebrew | ❌ |
hebrew_general_ci | hebrew | ❌ |
hp8_bin | hp8 | ❌ |
hp8_english_ci | hp8 | ❌ |
keybcs2_bin | keybcs2 | ❌ |
keybcs2_general_ci | keybcs2 | ❌ |
koi8r_bin | koi8r | ❌ |
koi8r_general_ci | koi8r | ❌ |
koi8u_bin | koi8u | ❌ |
koi8u_general_ci | koi8u | ❌ |
latin1_bin | latin1 | ✅ |
latin1_danish_ci | latin1 | ✅ |
latin1_general_ci | latin1 | ✅ |
latin1_general_cs | latin1 | ✅ |
latin1_german1_ci | latin1 | ✅ |
latin1_german2_ci | latin1 | ✅ |
latin1_spanish_ci | latin1 | ✅ |
latin1_swedish_ci | latin1 | ✅ |
latin2_bin | latin2 | ❌ |
latin2_croatian_ci | latin2 | ❌ |
latin2_czech_cs | latin2 | ❌ |
latin2_general_ci | latin2 | ❌ |
latin2_hungarian_ci | latin2 | ❌ |
latin5_bin | latin5 | ❌ |
latin5_turkish_ci | latin5 | ❌ |
latin7_bin | latin7 | ✅ |
latin7_estonian_cs | latin7 | ✅ |
latin7_general_ci | latin7 | ✅ |
latin7_general_cs | latin7 | ✅ |
macce_bin | macce | ❌ |
macce_general_ci | macce | ❌ |
macroman_bin | macroman | ❌ |
macroman_general_ci | macroman | ❌ |
sjis_bin | sjis | ❌ |
sjis_japanese_ci | sjis | ❌ |
swe7_bin | swe7 | ✅ |
swe7_swedish_ci | swe7 | ✅ |
tis620_bin | tis620 | ❌ |
tis620_thai_ci | tis620 | ❌ |
ucs2_bin | ucs2 | ❌ |
ucs2_croatian_ci | ucs2 | ❌ |
ucs2_czech_ci | ucs2 | ❌ |
ucs2_danish_ci | ucs2 | ❌ |
ucs2_esperanto_ci | ucs2 | ❌ |
ucs2_estonian_ci | ucs2 | ❌ |
ucs2_general_ci | ucs2 | ❌ |
ucs2_general_mysql500_ci | ucs2 | ❌ |
ucs2_german2_ci | ucs2 | ❌ |
ucs2_hungarian_ci | ucs2 | ❌ |
ucs2_icelandic_ci | ucs2 | ❌ |
ucs2_latvian_ci | ucs2 | ❌ |
ucs2_lithuanian_ci | ucs2 | ❌ |
ucs2_persian_ci | ucs2 | ❌ |
ucs2_polish_ci | ucs2 | ❌ |
ucs2_roman_ci | ucs2 | ❌ |
ucs2_romanian_ci | ucs2 | ❌ |
ucs2_sinhala_ci | ucs2 | ❌ |
ucs2_slovak_ci | ucs2 | ❌ |
ucs2_slovenian_ci | ucs2 | ❌ |
ucs2_spanish2_ci | ucs2 | ❌ |
ucs2_spanish_ci | ucs2 | ❌ |
ucs2_swedish_ci | ucs2 | ❌ |
ucs2_turkish_ci | ucs2 | ❌ |
ucs2_unicode_520_ci | ucs2 | ❌ |
ucs2_unicode_ci | ucs2 | ❌ |
ucs2_vietnamese_ci | ucs2 | ❌ |
ujis_bin | ujis | ❌ |
ujis_japanese_ci | ujis | ❌ |
utf16_bin | utf16 | ✅ |
utf16_croatian_ci | utf16 | ✅ |
utf16_czech_ci | utf16 | ✅ |
utf16_danish_ci | utf16 | ✅ |
utf16_esperanto_ci | utf16 | ✅ |
utf16_estonian_ci | utf16 | ✅ |
utf16_general_ci | utf16 | ✅ |
utf16_german2_ci | utf16 | ✅ |
utf16_hungarian_ci | utf16 | ✅ |
utf16_icelandic_ci | utf16 | ✅ |
utf16_latvian_ci | utf16 | ✅ |
utf16_lithuanian_ci | utf16 | ✅ |
utf16_persian_ci | utf16 | ✅ |
utf16_polish_ci | utf16 | ✅ |
utf16_roman_ci | utf16 | ✅ |
utf16_romanian_ci | utf16 | ✅ |
utf16_sinhala_ci | utf16 | ✅ |
utf16_slovak_ci | utf16 | ✅ |
utf16_slovenian_ci | utf16 | ✅ |
utf16_spanish2_ci | utf16 | ✅ |
utf16_spanish_ci | utf16 | ✅ |
utf16_swedish_ci | utf16 | ✅ |
utf16_turkish_ci | utf16 | ✅ |
utf16_unicode_520_ci | utf16 | ✅ |
utf16_unicode_ci | utf16 | ✅ |
utf16_vietnamese_ci | utf16 | ✅ |
utf16le_bin | utf16le | ❌ |
utf16le_general_ci | utf16le | ❌ |
utf32_bin | utf32 | ✅ |
utf32_croatian_ci | utf32 | ✅ |
utf32_czech_ci | utf32 | ✅ |
utf32_danish_ci | utf32 | ✅ |
utf32_esperanto_ci | utf32 | ✅ |
utf32_estonian_ci | utf32 | ✅ |
utf32_general_ci | utf32 | ✅ |
utf32_german2_ci | utf32 | ✅ |
utf32_hungarian_ci | utf32 | ✅ |
utf32_icelandic_ci | utf32 | ✅ |
utf32_latvian_ci | utf32 | ✅ |
utf32_lithuanian_ci | utf32 | ✅ |
utf32_persian_ci | utf32 | ✅ |
utf32_polish_ci | utf32 | ✅ |
utf32_roman_ci | utf32 | ✅ |
utf32_romanian_ci | utf32 | ✅ |
utf32_sinhala_ci | utf32 | ✅ |
utf32_slovak_ci | utf32 | ✅ |
utf32_slovenian_ci | utf32 | ✅ |
utf32_spanish2_ci | utf32 | ✅ |
utf32_spanish_ci | utf32 | ✅ |
utf32_swedish_ci | utf32 | ✅ |
utf32_turkish_ci | utf32 | ✅ |
utf32_unicode_520_ci | utf32 | ✅ |
utf32_unicode_ci | utf32 | ✅ |
utf32_vietnamese_ci | utf32 | ✅ |
utf8mb3_bin | utf8mb3 | ✅ |
utf8mb3_croatian_ci | utf8mb3 | ✅ |
utf8mb3_czech_ci | utf8mb3 | ✅ |
utf8mb3_danish_ci | utf8mb3 | ✅ |
utf8mb3_esperanto_ci | utf8mb3 | ✅ |
utf8mb3_estonian_ci | utf8mb3 | ✅ |
utf8mb3_general_ci | utf8mb3 | ✅ |
utf8mb3_general_mysql500_ci | utf8mb3 | ✅ |
utf8mb3_german2_ci | utf8mb3 | ✅ |
utf8mb3_hungarian_ci | utf8mb3 | ✅ |
utf8mb3_icelandic_ci | utf8mb3 | ✅ |
utf8mb3_latvian_ci | utf8mb3 | ✅ |
utf8mb3_lithuanian_ci | utf8mb3 | ✅ |
utf8mb3_persian_ci | utf8mb3 | ✅ |
utf8mb3_polish_ci | utf8mb3 | ✅ |
utf8mb3_roman_ci | utf8mb3 | ✅ |
utf8mb3_romanian_ci | utf8mb3 | ✅ |
utf8mb3_sinhala_ci | utf8mb3 | ✅ |
utf8mb3_slovak_ci | utf8mb3 | ✅ |
utf8mb3_slovenian_ci | utf8mb3 | ✅ |
utf8mb3_spanish2_ci | utf8mb3 | ✅ |
utf8mb3_spanish_ci | utf8mb3 | ✅ |
utf8mb3_swedish_ci | utf8mb3 | ✅ |
utf8mb3_tolower_ci | utf8mb3 | ✅ |
utf8mb3_turkish_ci | utf8mb3 | ✅ |
utf8mb3_unicode_520_ci | utf8mb3 | ✅ |
utf8mb3_unicode_ci | utf8mb3 | ✅ |
utf8mb3_vietnamese_ci | utf8mb3 | ✅ |
utf8mb4_0900_ai_ci | utf8mb4 | ✅ |
utf8mb4_0900_as_ci | utf8mb4 | ✅ |
utf8mb4_0900_as_cs | utf8mb4 | ✅ |
utf8mb4_0900_bin | utf8mb4 | ✅ |
utf8mb4_bg_0900_ai_ci | utf8mb4 | ❌ |
utf8mb4_bg_0900_as_cs | utf8mb4 | ❌ |