mirror of
https://github.com/apache/datafusion-sqlparser-rs.git
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97 lines
3 KiB
Rust
97 lines
3 KiB
Rust
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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use crate::dialect::Dialect;
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// A [`Dialect`] for [ClickHouse](https://clickhouse.com/).
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#[derive(Debug)]
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pub struct ClickHouseDialect {}
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impl Dialect for ClickHouseDialect {
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fn is_identifier_start(&self, ch: char) -> bool {
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// See https://clickhouse.com/docs/en/sql-reference/syntax/#syntax-identifiers
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ch.is_ascii_lowercase() || ch.is_ascii_uppercase() || ch == '_'
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}
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fn is_identifier_part(&self, ch: char) -> bool {
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self.is_identifier_start(ch) || ch.is_ascii_digit()
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}
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fn supports_string_literal_backslash_escape(&self) -> bool {
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true
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}
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fn supports_select_wildcard_except(&self) -> bool {
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true
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}
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fn describe_requires_table_keyword(&self) -> bool {
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true
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}
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fn require_interval_qualifier(&self) -> bool {
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true
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}
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fn supports_limit_comma(&self) -> bool {
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true
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}
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fn supports_insert_table_function(&self) -> bool {
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true
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}
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fn supports_insert_format(&self) -> bool {
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true
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}
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fn supports_numeric_literal_underscores(&self) -> bool {
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true
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}
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// ClickHouse uses this for some FORMAT expressions in `INSERT` context, e.g. when inserting
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// with FORMAT JSONEachRow a raw JSON key-value expression is valid and expected.
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//
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// [ClickHouse formats](https://clickhouse.com/docs/en/interfaces/formats)
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fn supports_dictionary_syntax(&self) -> bool {
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true
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}
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/// See <https://clickhouse.com/docs/en/sql-reference/functions#higher-order-functions---operator-and-lambdaparams-expr-function>
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fn supports_lambda_functions(&self) -> bool {
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true
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}
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fn supports_from_first_select(&self) -> bool {
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true
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}
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/// See <https://clickhouse.com/docs/en/sql-reference/statements/select/order-by>
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fn supports_order_by_all(&self) -> bool {
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true
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}
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// See <https://clickhouse.com/docs/en/sql-reference/aggregate-functions/grouping_function#grouping-sets>
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fn supports_group_by_expr(&self) -> bool {
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true
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}
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/// See <https://clickhouse.com/docs/en/sql-reference/statements/select/group-by#rollup-modifier>
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fn supports_group_by_with_modifier(&self) -> bool {
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true
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}
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}
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