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a63483b9b1
Co-authored-by: Superset Dev <dev@superset.apache.org> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com> Co-authored-by: Joe Li <joe@preset.io>
65 lines
2.4 KiB
Python
65 lines
2.4 KiB
Python
# 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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from sqlglot import exp
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from sqlglot.dialects.dialect import rename_func
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from sqlglot.dialects.dremio import Dremio as SqlglotDremio
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from sqlglot.generators.dremio import DremioGenerator
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from sqlglot.parsers.dremio import DremioParser
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class DremioRegexpSplit(exp.Expression, exp.Func):
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"""
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Custom REGEXP_SPLIT function for Dremio that supports 4 arguments.
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sqlglot's native Dremio dialect does not parse this form; Superset adds
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it on top until it lands upstream.
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In sqlglot 30 the Expression class was split from the Func base class; custom
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Func subclasses must now explicitly inherit from both exp.Expression and exp.Func
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so that exp.Expression._set_parent is reachable via the MRO.
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"""
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arg_types = {
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"this": True, # string to split
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"expression": True, # delimiter pattern
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"mode": True, # mode (like 'ALL') - required in Dremio
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"limit": True, # limit - required in Dremio
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}
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class Dremio(SqlglotDremio):
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"""
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Superset's Dremio dialect, built on sqlglot's native Dremio dialect.
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Adds the 4-argument REGEXP_SPLIT form on top of everything sqlglot
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already gets right for Dremio (type mapping, DATE_ADD/DATE_SUB
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semantics, TO_CHAR, CURRENT_DATE_UTC, timestamp-timezone rejection).
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"""
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class Parser(DremioParser):
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FUNCTIONS = {
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**DremioParser.FUNCTIONS,
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"REGEXP_SPLIT": DremioRegexpSplit.from_arg_list,
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}
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class Generator(DremioGenerator):
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TRANSFORMS = {
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**DremioGenerator.TRANSFORMS,
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DremioRegexpSplit: rename_func("REGEXP_SPLIT"),
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}
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