mirror of https://github.com/apache/druid.git
67 lines
4.3 KiB
Markdown
67 lines
4.3 KiB
Markdown
---
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id: sql-multivalue-string-functions
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title: "SQL multi-value string functions"
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sidebar_label: "Multi-value string functions"
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---
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~ Licensed to the Apache Software Foundation (ASF) under one
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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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~ http://www.apache.org/licenses/LICENSE-2.0
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~ Unless required by applicable law or agreed to in writing,
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~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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~ specific language governing permissions and limitations
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~ under the License.
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<!--
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The format of the tables that describe the functions and operators
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should not be changed without updating the script create-sql-docs
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in web-console/script/create-sql-docs, because the script detects
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patterns in this markdown file and parse it to TypeScript file for web console
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-->
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:::info
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Apache Druid supports two query languages: Druid SQL and [native queries](querying.md).
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This document describes the SQL language.
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:::
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Druid supports string dimensions containing multiple values.
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This page describes the operations you can perform on multi-value string dimensions using [Druid SQL](./sql.md).
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See [SQL multi-value strings](./sql-data-types.md#multi-value-strings) and native [Multi-value dimensions](multi-value-dimensions.md) for more information.
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All array references in the multi-value string function documentation can refer to multi-value string columns or
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`ARRAY` types. These functions are largely identical to the [array functions](./sql-array-functions.md), but use
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`VARCHAR` types and behavior. Multi-value strings can also be converted to `ARRAY` types using `MV_TO_ARRAY`, and
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`ARRAY` into multi-value strings via `ARRAY_TO_MV`. For additional details about `ARRAY` types, see
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[`ARRAY` data type documentation](./sql-data-types.md#arrays).
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|Function|Description|
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|--------|-----|
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|`MV_FILTER_ONLY(expr, arr)`|Filters multi-value `expr` to include only values contained in array `arr`.|
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|`MV_FILTER_NONE(expr, arr)`|Filters multi-value `expr` to include no values contained in array `arr`.|
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|`MV_LENGTH(arr)`|Returns length of the array expression.|
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|`MV_OFFSET(arr, long)`|Returns the array element at the 0-based index supplied, or null for an out of range index.|
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|`MV_ORDINAL(arr, long)`|Returns the array element at the 1-based index supplied, or null for an out of range index.|
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|`MV_CONTAINS(arr, expr)`|If `expr` is a scalar type, returns 1 if `arr` contains `expr`. If `expr` is an array, returns 1 if `arr` contains all elements of `expr`. Otherwise returns 0.|
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|`MV_OVERLAP(arr1, arr2)`|Returns 1 if `arr1` and `arr2` have any elements in common, else 0.|
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|`MV_OFFSET_OF(arr, expr)`|Returns the 0-based index of the first occurrence of `expr` in the array. If no matching elements exist in the array, returns `null` or -1 if `druid.generic.useDefaultValueForNull=true` (deprecated legacy mode).|
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|`MV_ORDINAL_OF(arr, expr)`|Returns the 1-based index of the first occurrence of `expr` in the array. If no matching elements exist in the array, returns `null` or `-1` if `druid.generic.useDefaultValueForNull=true` (deprecated legacy mode).|
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|`MV_PREPEND(expr, arr)`|Adds `expr` to the beginning of `arr`, the resulting array type determined by the type `arr`.|
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|`MV_APPEND(arr, expr)`|Appends `expr` to `arr`, the resulting array type determined by the type of `arr`.|
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|`MV_CONCAT(arr1, arr2)`|Concatenates `arr2` to `arr1`. The resulting array type is determined by the type of `arr1`.|
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|`MV_SLICE(arr, start, end)`|Returns the subarray of `arr` from the 0-based index start(inclusive) to end(exclusive), or `null`, if start is less than 0, greater than length of arr or greater than end.|
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|`MV_TO_STRING(arr, str)`|Joins all elements of `arr` by the delimiter specified by `str`.|
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|`STRING_TO_MV(str1, str2)`|Splits `str1` into an array on the delimiter specified by `str2`, which is a regular expression.|
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|`MV_TO_ARRAY(str)`|Converts a multi-value string from a `VARCHAR` to a `VARCHAR ARRAY`.|
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