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regexp_like, improve docs and examples for regexp_match` (#9137)
* Add regexp_like scalar function * prettier update. * Revert changes outside of the regexp_like PR. * Moved dataframe examples to docs on the actual functions and extracted the test data to a csv file. * Changed pathing to make ci script happy. * improved examples with expected output.
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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF licenses this file | ||
| // to you under the Apache License, Version 2.0 (the | ||
| // "License"); you may not use this file except in compliance | ||
| // with the License. You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, | ||
| // software distributed under the License is distributed on an | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
|
|
||
| use datafusion::error::Result; | ||
| use datafusion::prelude::*; | ||
| use datafusion_common::{assert_batches_eq, assert_contains}; | ||
|
|
||
| /// This example demonstrates how to use the regexp_* functions | ||
| /// | ||
| /// the full list of supported features and | ||
| /// syntax can be found at | ||
| /// https://docs.rs/regex/latest/regex/#syntax | ||
| /// | ||
| /// Supported flags can be found at | ||
| /// https://docs.rs/regex/latest/regex/#grouping-and-flags | ||
| #[tokio::main] | ||
| async fn main() -> Result<()> { | ||
| let ctx = SessionContext::new(); | ||
| ctx.register_csv( | ||
| "examples", | ||
| "../../datafusion/physical-expr/tests/data/regex.csv", | ||
| CsvReadOptions::new(), | ||
| ) | ||
| .await?; | ||
|
|
||
| // | ||
| // | ||
| //regexp_like examples | ||
| // | ||
| // | ||
| // regexp_like format is (regexp_like(text, regex[, flags]) | ||
| // | ||
|
|
||
| // use sql and regexp_like function to test col 'values', against patterns in col 'patterns' without flags | ||
| let result = ctx | ||
| .sql("select regexp_like(values, patterns) from examples") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+------------------------------------------------+", | ||
| "| regexp_like(examples.values,examples.patterns) |", | ||
| "+------------------------------------------------+", | ||
| "| true |", | ||
| "| true |", | ||
| "| false |", | ||
| "| false |", | ||
| "| false |", | ||
| "| false |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "+------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // use sql and regexp_like function to test col 'values', against patterns in col 'patterns' with flags | ||
| let result = ctx | ||
| .sql("select regexp_like(values, patterns, flags) from examples") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+---------------------------------------------------------------+", | ||
| "| regexp_like(examples.values,examples.patterns,examples.flags) |", | ||
| "+---------------------------------------------------------------+", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "| false |", | ||
| "| false |", | ||
| "| false |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "| true |", | ||
| "+---------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // literals work as well | ||
| // to match against the entire input use ^ and $ in the regex | ||
| let result = ctx | ||
| .sql("select regexp_like('John Smith', '^.*Smith$'), regexp_like('Smith Jones', '^Smith.*$')") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+---------------------------------------------------+----------------------------------------------------+", | ||
| "| regexp_like(Utf8(\"John Smith\"),Utf8(\"^.*Smith$\")) | regexp_like(Utf8(\"Smith Jones\"),Utf8(\"^Smith.*$\")) |", | ||
| "+---------------------------------------------------+----------------------------------------------------+", | ||
| "| true | true |", | ||
| "+---------------------------------------------------+----------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // look-around and back references are not supported for performance | ||
| // reasons. | ||
| // Note that an error may not always be returned but the result | ||
| // if returned will always be false | ||
| let result = ctx | ||
| .sql(r"select regexp_like('(?<=[A-Z]\w )Smith', 'John Smith', 'i') as a") | ||
| .await? | ||
| .collect() | ||
| .await; | ||
|
|
||
| assert!(result.is_ok()); | ||
| let result = result.unwrap(); | ||
| assert_eq!(result.len(), 1); | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+-------+", | ||
| "| a |", | ||
| "+-------+", | ||
| "| false |", | ||
| "+-------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
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| // invalid flags will result in an error | ||
| let result = ctx | ||
| .sql(r"select regexp_like('\b4(?!000)\d\d\d\b', 4010, 'g')") | ||
| .await? | ||
| .collect() | ||
| .await; | ||
|
|
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| let expected = "regexp_like() does not support the \"global\" option"; | ||
| assert_contains!(result.unwrap_err().to_string(), expected); | ||
|
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| // there is a size limit on the regex during regex compilation | ||
| let result = ctx | ||
| .sql("select regexp_like('aaaaa', 'a{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}{5}')") | ||
| .await? | ||
| .collect() | ||
| .await; | ||
|
|
||
| let expected = "Regular expression did not compile: CompiledTooBig"; | ||
| assert_contains!(result.unwrap_err().to_string(), expected); | ||
|
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||
| // | ||
| // | ||
| //regexp_match examples | ||
| // | ||
| // | ||
| // regexp_match format is (regexp_match(text, regex[, flags]) | ||
| // | ||
|
|
||
| let _ = ctx.table("examples").await?; | ||
|
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| // use sql and regexp_match function to test col 'values', against patterns in col 'patterns' without flags | ||
| let result = ctx | ||
| .sql("select regexp_match(values, patterns) from examples") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+-------------------------------------------------+", | ||
| "| regexp_match(examples.values,examples.patterns) |", | ||
| "+-------------------------------------------------+", | ||
| "| [a] |", | ||
| "| [A] |", | ||
| "| |", | ||
| "| |", | ||
| "| |", | ||
| "| |", | ||
| "| [010] |", | ||
| "| [Düsseldorf] |", | ||
| "| [Москва] |", | ||
| "| [Köln] |", | ||
| "| [اليوم] |", | ||
| "+-------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
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||
| // use dataframe and regexp_match function to test col 'values', against patterns in col 'patterns' with flags | ||
| let result = ctx | ||
| .sql("select regexp_match(values, patterns, flags) from examples") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+----------------------------------------------------------------+", | ||
| "| regexp_match(examples.values,examples.patterns,examples.flags) |", | ||
| "+----------------------------------------------------------------+", | ||
| "| [a] |", | ||
| "| [A] |", | ||
| "| [B] |", | ||
| "| |", | ||
| "| |", | ||
| "| |", | ||
| "| [010] |", | ||
| "| [Düsseldorf] |", | ||
| "| [Москва] |", | ||
| "| [Köln] |", | ||
| "| [اليوم] |", | ||
| "+----------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
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||
| // literals work as well | ||
| // to match against the entire input use ^ and $ in the regex | ||
| let result = ctx | ||
| .sql("select regexp_match('John Smith', '^.*Smith$'), regexp_match('Smith Jones', '^Smith.*$')") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+----------------------------------------------------+-----------------------------------------------------+", | ||
| "| regexp_match(Utf8(\"John Smith\"),Utf8(\"^.*Smith$\")) | regexp_match(Utf8(\"Smith Jones\"),Utf8(\"^Smith.*$\")) |", | ||
| "+----------------------------------------------------+-----------------------------------------------------+", | ||
| "| [John Smith] | [Smith Jones] |", | ||
| "+----------------------------------------------------+-----------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // | ||
| // | ||
| //regexp_replace examples | ||
| // | ||
| // | ||
| // regexp_replace format is (regexp_replace(text, regex, replace[, flags]) | ||
| // | ||
|
|
||
| // use regexp_replace function against tables | ||
| let result = ctx | ||
| .sql("SELECT regexp_replace(values, patterns, replacement, concat('g', flags)) FROM examples") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+---------------------------------------------------------------------------------------------------------+", | ||
| "| regexp_replace(examples.values,examples.patterns,examples.replacement,concat(Utf8(\"g\"),examples.flags)) |", | ||
| "+---------------------------------------------------------------------------------------------------------+", | ||
| "| bbabbbc |", | ||
| "| B |", | ||
| "| aec |", | ||
| "| AbC |", | ||
| "| aBC |", | ||
| "| 4000 |", | ||
| "| xyz |", | ||
| "| München |", | ||
| "| Moscow |", | ||
| "| Koln |", | ||
| "| Today |", | ||
| "+---------------------------------------------------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
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||
| // global flag example | ||
| let result = ctx | ||
| .sql("SELECT regexp_replace('foobarbaz', 'b(..)', 'X\\1Y', 'g')") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+------------------------------------------------------------------------+", | ||
| "| regexp_replace(Utf8(\"foobarbaz\"),Utf8(\"b(..)\"),Utf8(\"X\\1Y\"),Utf8(\"g\")) |", | ||
| "+------------------------------------------------------------------------+", | ||
| "| fooXarYXazY |", | ||
| "+------------------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // without global flag | ||
| let result = ctx | ||
| .sql("SELECT regexp_replace('foobarbaz', 'b(..)', 'X\\1Y')") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
|
||
| assert_batches_eq!( | ||
| &[ | ||
| "+--------------------------------------------------------------+", | ||
| "| regexp_replace(Utf8(\"foobarbaz\"),Utf8(\"b(..)\"),Utf8(\"X\\1Y\")) |", | ||
| "+--------------------------------------------------------------+", | ||
| "| fooXarYbaz |", | ||
| "+--------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| // null regex means null result | ||
| let result = ctx | ||
| .sql("SELECT regexp_replace('foobarbaz', NULL, 'X\\1Y', 'g')") | ||
| .await? | ||
| .collect() | ||
| .await?; | ||
|
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||
| assert_batches_eq!( | ||
| &[ | ||
| "+---------------------------------------------------------------+", | ||
| "| regexp_replace(Utf8(\"foobarbaz\"),NULL,Utf8(\"X\\1Y\"),Utf8(\"g\")) |", | ||
| "+---------------------------------------------------------------+", | ||
| "| |", | ||
| "+---------------------------------------------------------------+", | ||
| ], | ||
| &result | ||
| ); | ||
|
|
||
| Ok(()) | ||
| } |
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