mirror of
https://github.com/apache/datafusion-sqlparser-rs.git
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66 lines
2.4 KiB
Rust
66 lines
2.4 KiB
Rust
// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use crate::dialect::Dialect;
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use core::iter::Peekable;
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use core::str::Chars;
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use super::PostgreSqlDialect;
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/// A [`Dialect`] for [RedShift](https://aws.amazon.com/redshift/)
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#[derive(Debug)]
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pub struct RedshiftSqlDialect {}
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// In most cases the redshift dialect is identical to [`PostgresSqlDialect`].
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//
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// Notable differences:
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// 1. Redshift treats brackets `[` and `]` differently. For example, `SQL SELECT a[1][2] FROM b`
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// in the Postgres dialect, the query will be parsed as an array, while in the Redshift dialect it will
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// be a json path
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impl Dialect for RedshiftSqlDialect {
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fn is_delimited_identifier_start(&self, ch: char) -> bool {
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ch == '"' || ch == '['
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}
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/// Determine if quoted characters are proper for identifier
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/// It's needed to distinguish treating square brackets as quotes from
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/// treating them as json path. If there is identifier then we assume
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/// there is no json path.
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fn is_proper_identifier_inside_quotes(&self, mut chars: Peekable<Chars<'_>>) -> bool {
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chars.next();
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let mut not_white_chars = chars.skip_while(|ch| ch.is_whitespace()).peekable();
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if let Some(&ch) = not_white_chars.peek() {
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return self.is_identifier_start(ch);
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}
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false
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}
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fn is_identifier_start(&self, ch: char) -> bool {
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// Extends Postgres dialect with sharp
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PostgreSqlDialect {}.is_identifier_start(ch) || ch == '#'
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}
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fn is_identifier_part(&self, ch: char) -> bool {
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// Extends Postgres dialect with sharp
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PostgreSqlDialect {}.is_identifier_part(ch) || ch == '#'
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}
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/// redshift has `CONVERT(type, value)` instead of `CONVERT(value, type)`
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/// <https://docs.aws.amazon.com/redshift/latest/dg/r_CONVERT_function.html>
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fn convert_type_before_value(&self) -> bool {
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true
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}
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fn supports_connect_by(&self) -> bool {
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true
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}
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}
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