Use the dialect configuration

docs/en/operations/settings/settings-formats.md

@@ -242,26 +242,6 @@ See also:
 - [DateTime data type.](../../sql-reference/data-types/datetime.md)
 - [Functions for working with dates and times.](../../sql-reference/functions/date-time-functions.md)
 
-## interval_format {#interval_format}
-
-Allows choosing different output formats of the text representation of interval types.
-
-Possible values:
-
--   `kql` - KQL-style output format.
-
-    ClickHouse outputs intervals in [KQL format](https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-timespan-format-strings#the-constant-c-format-specifier). For example, `toIntervalDay(2)` would be formatted as `2.00:00:00`. Please note that for interval types of varying length (ie. `IntervalMonth` and `IntervalYear`) the average number of seconds per interval is taken into account.
-
--   `numeric` - Numeric output format.
-
-    ClickHouse outputs intervals as their underlying numeric representation. For example, `toIntervalDay(2)` would be formatted as `2`.
-
-Default value: `numeric`.
-
-See also:
-
--   [Interval](../../sql-reference/data-types/special-data-types/interval.md)
-
 ## input_format_ipv4_default_on_conversion_error {#input_format_ipv4_default_on_conversion_error}
 
 Deserialization of IPv4 will use default values instead of throwing exception on conversion error.

docs/en/operations/settings/settings.md

@@ -98,6 +98,26 @@ Default value: 0.
 </profiles>
 ```
 
+## dialect {#dialect}
+
+Allows choosing support for different query languages.
+
+Possible values:
+
+-   `clickhouse` - ClickHouse SQL.
+-   `kusto` - Microsoft KQL.
+-   `kusto_auto` - Tries ClickHouse SQL first, then Microsoft KQL.
+
+In mode `clickhouse`, ClickHouse outputs intervals as their underlying numeric representation. For example, `toIntervalDay(2)` would be formatted as `2`.
+
+In modes `kusto` and `kusto_auto`, ClickHouse outputs intervals in [KQL format](https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-timespan-format-strings#the-constant-c-format-specifier). For example, `toIntervalDay(2)` would be formatted as `2.00:00:00`. Please note that for interval types of varying length (ie. `IntervalMonth` and `IntervalYear`) the average number of seconds per interval is taken into account.
+
+Default value: `clickhouse`.
+
+See also:
+
+-   [Interval](../../sql-reference/data-types/special-data-types/interval.md)
+
 ## distributed_product_mode {#distributed-product-mode}
 
 Changes the behaviour of [distributed subqueries](../../sql-reference/operators/in.md).

src/Core/Settings.h

@@ -906,7 +906,6 @@ class IColumn;
     \
     M(DateTimeInputFormat, date_time_input_format, FormatSettings::DateTimeInputFormat::Basic, "Method to read DateTime from text input formats. Possible values: 'basic', 'best_effort' and 'best_effort_us'.", 0) \
     M(DateTimeOutputFormat, date_time_output_format, FormatSettings::DateTimeOutputFormat::Simple, "Method to write DateTime to text output. Possible values: 'simple', 'iso', 'unix_timestamp'.", 0) \
-    M(IntervalFormat, interval_format, FormatSettings::IntervalFormat::Numeric, "Textual representation of Interval. Possible values: 'kql', 'numeric'.", 0) \
     \
     M(Bool, input_format_ipv4_default_on_conversion_error, false, "Deserialization of IPv4 will use default values instead of throwing exception on conversion error.", 0) \
     M(Bool, input_format_ipv6_default_on_conversion_error, false, "Deserialization of IPV6 will use default values instead of throwing exception on conversion error.", 0) \

src/Core/SettingsEnums.cpp

@@ -79,10 +79,6 @@ IMPLEMENT_SETTING_ENUM(DateTimeOutputFormat, ErrorCodes::BAD_ARGUMENTS,
      {"iso",            FormatSettings::DateTimeOutputFormat::ISO},
      {"unix_timestamp", FormatSettings::DateTimeOutputFormat::UnixTimestamp}})
 
-IMPLEMENT_SETTING_ENUM_WITH_RENAME(IntervalFormat, ErrorCodes::BAD_ARGUMENTS,
-    {{"kql",     FormatSettings::IntervalFormat::KQL},
-     {"numeric", FormatSettings::IntervalFormat::Numeric}})
-
 IMPLEMENT_SETTING_AUTO_ENUM(LogsLevel, ErrorCodes::BAD_ARGUMENTS)
 
 IMPLEMENT_SETTING_AUTO_ENUM(LogQueriesType, ErrorCodes::BAD_ARGUMENTS)

src/Core/SettingsEnums.h

@@ -72,8 +72,6 @@ DECLARE_SETTING_ENUM_WITH_RENAME(DateTimeInputFormat, FormatSettings::DateTimeIn
 
 DECLARE_SETTING_ENUM_WITH_RENAME(DateTimeOutputFormat, FormatSettings::DateTimeOutputFormat)
 
-DECLARE_SETTING_ENUM_WITH_RENAME(IntervalFormat, FormatSettings::IntervalFormat)
-
 DECLARE_SETTING_ENUM_WITH_RENAME(ParquetVersion, FormatSettings::ParquetVersion)
 
 enum class LogsLevel

src/Formats/FormatFactory.cpp

@@ -19,6 +19,15 @@
 
 #include <boost/algorithm/string/case_conv.hpp>
 
+namespace
+{
+DB::FormatSettings::IntervalFormat convert(const DB::Dialect dialect)
+{
+    return dialect == DB::Dialect::kusto || dialect == DB::Dialect::kusto_auto ? DB::FormatSettings::IntervalFormat::KQL
+                                                                               : DB::FormatSettings::IntervalFormat::Numeric;
+}
+}
+
 namespace DB
 {
 
@@ -86,7 +95,7 @@ FormatSettings getFormatSettings(ContextPtr context, const Settings & settings)
     format_settings.custom.skip_trailing_empty_lines = settings.input_format_custom_skip_trailing_empty_lines;
     format_settings.date_time_input_format = settings.date_time_input_format;
     format_settings.date_time_output_format = settings.date_time_output_format;
-    format_settings.interval.format = settings.interval_format;
+    format_settings.interval.format = convert(context->getSettingsRef().dialect);
     format_settings.input_format_ipv4_default_on_conversion_error = settings.input_format_ipv4_default_on_conversion_error;
     format_settings.input_format_ipv6_default_on_conversion_error = settings.input_format_ipv6_default_on_conversion_error;
     format_settings.bool_true_representation = settings.bool_true_representation;

tests/queries/0_stateless/02366_kql_native_interval_format.reference

@@ -1,16 +1,4 @@
-numeric
-kql
-00:00:00
-00:00:00.0000001
-00:00:00.0010000
-00:00:42
-01:06:00
-2.18:00:00
-5.00:00:00
-7.00:00:00
-14.00:00:00
-('00:01:12','21.00:00:00','00:00:00.0000002')
-numeric
+clickhouse
 99
 100
 1
@@ -21,3 +9,14 @@ numeric
 1
 2
 (72,3,200)
+kusto_auto
+00:00:00
+00:00:00.0000001
+00:00:00.0010000
+00:00:42
+01:06:00
+2.18:00:00
+5.00:00:00
+7.00:00:00
+14.00:00:00
+('00:01:12','21.00:00:00','00:00:00.0000002')

tests/queries/0_stateless/02366_kql_native_interval_format.sql.j2

@@ -1,8 +1,6 @@
-select value from system.settings where name = 'interval_format';
-
-{% for format in ['kql', 'numeric'] -%}
-select '{{ format }}';
-set interval_format = '{{ format }}';
+{% for dialect in ['clickhouse', 'kusto_auto'] -%}
+select '{{ dialect }}';
+set dialect = '{{ dialect }}';
 select toIntervalNanosecond(99);
 select toIntervalNanosecond(100);
 select toIntervalMillisecond(1);