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from sqlglot import exp
from sqlglot.dialects.dialect import Dialect, inline_array_sql
from sqlglot.generator import Generator
from sqlglot.parser import Parser
from sqlglot.tokens import Tokenizer, TokenType
class ClickHouse(Dialect):
normalize_functions = None
null_ordering = "nulls_are_last"
class Tokenizer(Tokenizer):
IDENTIFIERS = ['"', "`"]
KEYWORDS = {
**Tokenizer.KEYWORDS,
"NULLABLE": TokenType.NULLABLE,
"FINAL": TokenType.FINAL,
"INT8": TokenType.TINYINT,
"INT16": TokenType.SMALLINT,
"INT32": TokenType.INT,
"INT64": TokenType.BIGINT,
"FLOAT32": TokenType.FLOAT,
"FLOAT64": TokenType.DOUBLE,
}
class Parser(Parser):
def _parse_table(self, schema=False):
this = super()._parse_table(schema)
if self._match(TokenType.FINAL):
this = self.expression(exp.Final, this=this)
return this
class Generator(Generator):
STRUCT_DELIMITER = ("(", ")")
TYPE_MAPPING = {
**Generator.TYPE_MAPPING,
exp.DataType.Type.NULLABLE: "Nullable",
}
TRANSFORMS = {
**Generator.TRANSFORMS,
exp.Array: inline_array_sql,
exp.Final: lambda self, e: f"{self.sql(e, 'this')} FINAL",
}
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