summaryrefslogtreecommitdiffstats
path: root/sqlglot/dialects
diff options
context:
space:
mode:
Diffstat (limited to 'sqlglot/dialects')
-rw-r--r--sqlglot/dialects/__init__.py15
-rw-r--r--sqlglot/dialects/bigquery.py7
-rw-r--r--sqlglot/dialects/duckdb.py9
-rw-r--r--sqlglot/dialects/hive.py2
-rw-r--r--sqlglot/dialects/mysql.py2
-rw-r--r--sqlglot/dialects/oracle.py10
-rw-r--r--sqlglot/dialects/postgres.py14
-rw-r--r--sqlglot/dialects/presto.py2
-rw-r--r--sqlglot/dialects/redshift.py2
-rw-r--r--sqlglot/dialects/snowflake.py6
-rw-r--r--sqlglot/dialects/spark.py3
11 files changed, 45 insertions, 27 deletions
diff --git a/sqlglot/dialects/__init__.py b/sqlglot/dialects/__init__.py
index 34cf613..191e703 100644
--- a/sqlglot/dialects/__init__.py
+++ b/sqlglot/dialects/__init__.py
@@ -1,17 +1,14 @@
"""
## Dialects
-One of the core abstractions in SQLGlot is the concept of a "dialect". The `Dialect` class essentially implements a
-"SQLGlot dialect", which aims to be as generic and ANSI-compliant as possible. It relies on the base `Tokenizer`,
-`Parser` and `Generator` classes to achieve this goal, so these need to be very lenient when it comes to consuming
-SQL code.
+While there is a SQL standard, most SQL engines support a variation of that standard. This makes it difficult
+to write portable SQL code. SQLGlot bridges all the different variations, called "dialects", with an extensible
+SQL transpilation framework.
-However, there are cases where the syntax of different SQL dialects varies wildly, even for common tasks. One such
-example is the date/time functions, which can be hard to deal with. For this reason, it's sometimes necessary to
-override the base dialect in order to specialize its behavior. This can be easily done in SQLGlot: supporting new
-dialects is as simple as subclassing from `Dialect` and overriding its various components (e.g. the `Parser` class),
-in order to implement the target behavior.
+The base `sqlglot.dialects.dialect.Dialect` class implements a generic dialect that aims to be as universal as possible.
+Each SQL variation has its own `Dialect` subclass, extending the corresponding `Tokenizer`, `Parser` and `Generator`
+classes as needed.
### Implementing a custom Dialect
diff --git a/sqlglot/dialects/bigquery.py b/sqlglot/dialects/bigquery.py
index e7d30ec..27dca48 100644
--- a/sqlglot/dialects/bigquery.py
+++ b/sqlglot/dialects/bigquery.py
@@ -169,6 +169,13 @@ class BigQuery(Dialect):
TokenType.VALUES,
}
+ PROPERTY_PARSERS = {
+ **parser.Parser.PROPERTY_PARSERS, # type: ignore
+ "NOT DETERMINISTIC": lambda self: self.expression(
+ exp.VolatilityProperty, this=exp.Literal.string("VOLATILE")
+ ),
+ }
+
class Generator(generator.Generator):
TRANSFORMS = {
**generator.Generator.TRANSFORMS, # type: ignore
diff --git a/sqlglot/dialects/duckdb.py b/sqlglot/dialects/duckdb.py
index 81941f7..4646eb4 100644
--- a/sqlglot/dialects/duckdb.py
+++ b/sqlglot/dialects/duckdb.py
@@ -66,12 +66,11 @@ def _sort_array_reverse(args):
return exp.SortArray(this=seq_get(args, 0), asc=exp.false())
-def _struct_pack_sql(self, expression):
+def _struct_sql(self, expression):
args = [
- self.binary(e, ":=") if isinstance(e, exp.EQ) else self.sql(e)
- for e in expression.expressions
+ f"'{e.name or e.this.name}': {self.sql(e, 'expression')}" for e in expression.expressions
]
- return f"STRUCT_PACK({', '.join(args)})"
+ return f"{{{', '.join(args)}}}"
def _datatype_sql(self, expression):
@@ -153,7 +152,7 @@ class DuckDB(Dialect):
exp.StrToDate: lambda self, e: f"CAST({_str_to_time_sql(self, e)} AS DATE)",
exp.StrToTime: _str_to_time_sql,
exp.StrToUnix: lambda self, e: f"EPOCH(STRPTIME({self.sql(e, 'this')}, {self.format_time(e)}))",
- exp.Struct: _struct_pack_sql,
+ exp.Struct: _struct_sql,
exp.TableSample: no_tablesample_sql,
exp.TimeStrToDate: lambda self, e: f"CAST({self.sql(e, 'this')} AS DATE)",
exp.TimeStrToTime: timestrtotime_sql,
diff --git a/sqlglot/dialects/hive.py b/sqlglot/dialects/hive.py
index ddfd1e8..4bbec70 100644
--- a/sqlglot/dialects/hive.py
+++ b/sqlglot/dialects/hive.py
@@ -251,7 +251,7 @@ class Hive(Dialect):
PROPERTY_PARSERS = {
**parser.Parser.PROPERTY_PARSERS, # type: ignore
- TokenType.SERDE_PROPERTIES: lambda self: exp.SerdeProperties(
+ "WITH SERDEPROPERTIES": lambda self: exp.SerdeProperties(
expressions=self._parse_wrapped_csv(self._parse_property)
),
}
diff --git a/sqlglot/dialects/mysql.py b/sqlglot/dialects/mysql.py
index 2a0a917..cd8c30c 100644
--- a/sqlglot/dialects/mysql.py
+++ b/sqlglot/dialects/mysql.py
@@ -202,7 +202,7 @@ class MySQL(Dialect):
PROPERTY_PARSERS = {
**parser.Parser.PROPERTY_PARSERS, # type: ignore
- TokenType.ENGINE: lambda self: self._parse_property_assignment(exp.EngineProperty),
+ "ENGINE": lambda self: self._parse_property_assignment(exp.EngineProperty),
}
STATEMENT_PARSERS = {
diff --git a/sqlglot/dialects/oracle.py b/sqlglot/dialects/oracle.py
index 86caa6b..67d791d 100644
--- a/sqlglot/dialects/oracle.py
+++ b/sqlglot/dialects/oracle.py
@@ -74,13 +74,16 @@ class Oracle(Dialect):
def query_modifiers(self, expression, *sqls):
return csv(
*sqls,
- *[self.sql(sql) for sql in expression.args.get("laterals", [])],
- *[self.sql(sql) for sql in expression.args.get("joins", [])],
+ *[self.sql(sql) for sql in expression.args.get("joins") or []],
+ self.sql(expression, "match"),
+ *[self.sql(sql) for sql in expression.args.get("laterals") or []],
self.sql(expression, "where"),
self.sql(expression, "group"),
self.sql(expression, "having"),
self.sql(expression, "qualify"),
- self.sql(expression, "window"),
+ self.seg("WINDOW ") + self.expressions(expression, "windows", flat=True)
+ if expression.args.get("windows")
+ else "",
self.sql(expression, "distribute"),
self.sql(expression, "sort"),
self.sql(expression, "cluster"),
@@ -99,6 +102,7 @@ class Oracle(Dialect):
class Tokenizer(tokens.Tokenizer):
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
+ "MATCH_RECOGNIZE": TokenType.MATCH_RECOGNIZE,
"MINUS": TokenType.EXCEPT,
"START": TokenType.BEGIN,
"TOP": TokenType.TOP,
diff --git a/sqlglot/dialects/postgres.py b/sqlglot/dialects/postgres.py
index 6f597f1..0d74b3a 100644
--- a/sqlglot/dialects/postgres.py
+++ b/sqlglot/dialects/postgres.py
@@ -9,6 +9,7 @@ from sqlglot.dialects.dialect import (
no_paren_current_date_sql,
no_tablesample_sql,
no_trycast_sql,
+ rename_func,
str_position_sql,
trim_sql,
)
@@ -260,6 +261,16 @@ class Postgres(Dialect):
"TO_CHAR": format_time_lambda(exp.TimeToStr, "postgres"),
}
+ BITWISE = {
+ **parser.Parser.BITWISE, # type: ignore
+ TokenType.HASH: exp.BitwiseXor,
+ }
+
+ FACTOR = {
+ **parser.Parser.FACTOR, # type: ignore
+ TokenType.CARET: exp.Pow,
+ }
+
class Generator(generator.Generator):
TYPE_MAPPING = {
**generator.Generator.TYPE_MAPPING, # type: ignore
@@ -273,6 +284,7 @@ class Postgres(Dialect):
TRANSFORMS = {
**generator.Generator.TRANSFORMS, # type: ignore
+ exp.BitwiseXor: lambda self, e: self.binary(e, "#"),
exp.ColumnDef: preprocess(
[
_auto_increment_to_serial,
@@ -285,11 +297,13 @@ class Postgres(Dialect):
exp.JSONBExtract: lambda self, e: self.binary(e, "#>"),
exp.JSONBExtractScalar: lambda self, e: self.binary(e, "#>>"),
exp.JSONBContains: lambda self, e: self.binary(e, "?"),
+ exp.Pow: lambda self, e: self.binary(e, "^"),
exp.CurrentDate: no_paren_current_date_sql,
exp.CurrentTimestamp: lambda *_: "CURRENT_TIMESTAMP",
exp.DateAdd: _date_add_sql("+"),
exp.DateSub: _date_add_sql("-"),
exp.DateDiff: _date_diff_sql,
+ exp.LogicalOr: rename_func("BOOL_OR"),
exp.RegexpLike: lambda self, e: self.binary(e, "~"),
exp.RegexpILike: lambda self, e: self.binary(e, "~*"),
exp.StrPosition: str_position_sql,
diff --git a/sqlglot/dialects/presto.py b/sqlglot/dialects/presto.py
index a79a9f9..8175d6f 100644
--- a/sqlglot/dialects/presto.py
+++ b/sqlglot/dialects/presto.py
@@ -174,6 +174,7 @@ class Presto(Dialect):
"DATE_FORMAT": format_time_lambda(exp.TimeToStr, "presto"),
"DATE_PARSE": format_time_lambda(exp.StrToTime, "presto"),
"FROM_UNIXTIME": _from_unixtime,
+ "NOW": exp.CurrentTimestamp.from_arg_list,
"STRPOS": lambda args: exp.StrPosition(
this=seq_get(args, 0),
substr=seq_get(args, 1),
@@ -194,7 +195,6 @@ class Presto(Dialect):
FUNCTION_PARSERS.pop("TRIM")
class Generator(generator.Generator):
-
STRUCT_DELIMITER = ("(", ")")
ROOT_PROPERTIES = {exp.SchemaCommentProperty}
diff --git a/sqlglot/dialects/redshift.py b/sqlglot/dialects/redshift.py
index afd7913..7da881f 100644
--- a/sqlglot/dialects/redshift.py
+++ b/sqlglot/dialects/redshift.py
@@ -93,7 +93,7 @@ class Redshift(Postgres):
rows = [tuple_exp.expressions for tuple_exp in expression.expressions]
selects = []
for i, row in enumerate(rows):
- if i == 0:
+ if i == 0 and expression.alias:
row = [
exp.alias_(value, column_name)
for value, column_name in zip(row, expression.args["alias"].args["columns"])
diff --git a/sqlglot/dialects/snowflake.py b/sqlglot/dialects/snowflake.py
index 6225a53..db72a34 100644
--- a/sqlglot/dialects/snowflake.py
+++ b/sqlglot/dialects/snowflake.py
@@ -178,11 +178,6 @@ class Snowflake(Dialect):
),
}
- PROPERTY_PARSERS = {
- **parser.Parser.PROPERTY_PARSERS,
- TokenType.PARTITION_BY: lambda self: self._parse_partitioned_by(),
- }
-
class Tokenizer(tokens.Tokenizer):
QUOTES = ["'", "$$"]
ESCAPES = ["\\", "'"]
@@ -195,6 +190,7 @@ class Snowflake(Dialect):
KEYWORDS = {
**tokens.Tokenizer.KEYWORDS,
"EXCLUDE": TokenType.EXCEPT,
+ "MATCH_RECOGNIZE": TokenType.MATCH_RECOGNIZE,
"RENAME": TokenType.REPLACE,
"TIMESTAMP_LTZ": TokenType.TIMESTAMPLTZ,
"TIMESTAMP_NTZ": TokenType.TIMESTAMP,
diff --git a/sqlglot/dialects/spark.py b/sqlglot/dialects/spark.py
index 42d34c2..fc711ab 100644
--- a/sqlglot/dialects/spark.py
+++ b/sqlglot/dialects/spark.py
@@ -1,7 +1,7 @@
from __future__ import annotations
from sqlglot import exp, parser
-from sqlglot.dialects.dialect import create_with_partitions_sql, rename_func
+from sqlglot.dialects.dialect import create_with_partitions_sql, rename_func, trim_sql
from sqlglot.dialects.hive import Hive
from sqlglot.helper import seq_get
@@ -122,6 +122,7 @@ class Spark(Hive):
exp.Reduce: rename_func("AGGREGATE"),
exp.StructKwarg: lambda self, e: f"{self.sql(e, 'this')}: {self.sql(e, 'expression')}",
exp.TimestampTrunc: lambda self, e: f"DATE_TRUNC({self.sql(e, 'unit')}, {self.sql(e, 'this')})",
+ exp.Trim: trim_sql,
exp.VariancePop: rename_func("VAR_POP"),
exp.DateFromParts: rename_func("MAKE_DATE"),
exp.LogicalOr: rename_func("BOOL_OR"),
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-10 01:08:47 +0000