Update ext_dict_functions.md

docs/en/query_language/functions/ext_dict_functions.md

@@ -15,29 +15,29 @@ dictGetOrDefault('dict_name', 'attr_name', id_expr, default_value_expr)
 
 - `dict_name` — Name of the dictionary. [String literal](../syntax.md#syntax-string-literal).
 - `attr_name` — Name of the column of the dictionary. [String literal](../syntax.md#syntax-string-literal).
-- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value or [Tuple](../../data_types/tuple.md) depending on the dictionary configuration.
-- `default_value_expr` — Value which is returned if the dictionary doesn't contain a row with the `id_expr` key. [Expression](../syntax.md#syntax-expressions) returning the value of the data type configured for the `attr_name` attribute.
+- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md) or [Tuple](../../data_types/tuple.md)-type value depending on the dictionary configuration.
+- `default_value_expr` — Value returned if the dictionary doesn't contain a row with the `id_expr` key. [Expression](../syntax.md#syntax-expressions) returns the value in the data type configured for the `attr_name` attribute.
 
 **Returned value**
 
-- If ClickHouse parses the attribute successfully with the [attribute's data type](../dicts/external_dicts_dict_structure.md#ext_dict_structure-attributes), functions return the value of the dictionary attribute that corresponds to `id_expr`.
-- If there is no requested `id_expr` in the dictionary then:
+- If ClickHouse parses the attribute successfully in the [attribute's data type](../dicts/external_dicts_dict_structure.md#ext_dict_structure-attributes), functions return the value of the dictionary attribute that corresponds to `id_expr`.
+- If there is no requested `id_expr` in the dictionary, then:
 
-    - `dictGet` returns the content of the `<null_value>` element which is specified for the attribute in the dictionary configuration.
+    - `dictGet` returns the content of the `<null_value>` element specified for the attribute in the dictionary configuration.
     - `dictGetOrDefault` returns the value passed as the `default_value_expr` parameter.
 
 ClickHouse throws an exception if it cannot parse the value of the attribute or the value doesn't match the attribute data type.
 
-**Example of Use**
+**Example**
 
-Create the text file `ext-dict-text.csv` with the following content:
+Create a text file `ext-dict-text.csv` containing the following:
 
 ```text
 1,1
 2,2
 ```
 
-The first column is `id`, the second column is `c1`
+The first column is `id`, the second column is `c1`.
 
 Configure the external dictionary:
 
@@ -93,7 +93,7 @@ LIMIT 3
 
 ## dictHas
 
-Checks whether the dictionary has the key.
+Checks whether a key is present in a dictionary.
 
 ```
 dictHas('dict_name', id)
@@ -102,7 +102,7 @@ dictHas('dict_name', id)
 **Parameters**
 
 - `dict_name` — Name of the dictionary. [String literal](../syntax.md#syntax-string-literal).
-- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value.
+- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md)-type value.
 
 **Returned value**
 
@@ -113,7 +113,7 @@ Type: `UInt8`.
 
 ## dictGetHierarchy
 
-For the hierarchical dictionary, returns an array of dictionary keys starting from passed `id_expr` and continuing along the chain of parent elements.
+For the hierarchical dictionary, returns an array of dictionary keys starting from the passed `id_expr` and continuing along the chain of parent elements.
 
 ```
 dictGetHierarchy('dict_name', id)
@@ -122,7 +122,7 @@ dictGetHierarchy('dict_name', id)
 **Parameters**
 
 - `dict_name` — Name of the dictionary. [String literal](../syntax.md#syntax-string-literal).
-- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value.
+- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md)-type value.
 
 **Returned value**
 
@@ -139,8 +139,8 @@ Checks the ancestor of a key in the hierarchical dictionary.
 **Parameters**
 
 - `dict_name` — Name of the dictionary. [String literal](../syntax.md#syntax-string-literal).
-- `child_id_expr` — Key that should be checked. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value.
-- `ancestor_id_expr` — Alleged ancestor of the `child_id_expr` key. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value.
+- `child_id_expr` — Key to be checked. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md)-type value.
+- `ancestor_id_expr` — Alleged ancestor of the `child_id_expr` key. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md)-type value.
 
 **Returned value**
 
@@ -151,7 +151,7 @@ Type: `UInt8`.
 
 ## Other functions {#ext_dict_functions-other}
 
-ClickHouse supports the specialized functions that convert the dictionary attribute values to the strict data type independently of the configuration of the dictionary.
+ClickHouse supports specialized functions that convert dictionary attribute values to a specific data type regardless of the dictionary configuration.
 
 Functions:
 
@@ -163,7 +163,7 @@ Functions:
 - `dictGetUUID`
 - `dictGetString`
 
-All these functions have the `OrDefault` modification. For example, `dictGetDateOrDefault`.
+All these functions take the `OrDefault` modifier. For example, `dictGetDateOrDefault`.
 
 Syntax:
 
@@ -176,17 +176,17 @@ dictGet[Type]OrDefault('dict_name', 'attr_name', id_expr, default_value_expr)
 
 - `dict_name` — Name of the dictionary. [String literal](../syntax.md#syntax-string-literal).
 - `attr_name` — Name of the column of the dictionary. [String literal](../syntax.md#syntax-string-literal).
-- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returning  [UInt64](../../data_types/int_uint.md)-typed value.
-- `default_value_expr` — Value which is returned if the dictionary doesn't contain a row with the `id_expr` key. [Expression](../syntax.md#syntax-expressions) returning the value of the data type configured for the `attr_name` attribute.
+- `id_expr` — Key value. [Expression](../syntax.md#syntax-expressions) returns a [UInt64](../../data_types/int_uint.md)-type value.
+- `default_value_expr` — Value which is returned if the dictionary doesn't contain a row with the `id_expr` key. [Expression](../syntax.md#syntax-expressions) returns a value in the data type configured for the `attr_name` attribute.
 
 **Returned value**
 
-- If ClickHouse parses the attribute successfully with the [attribute's data type](../dicts/external_dicts_dict_structure.md#ext_dict_structure-attributes), functions return the value of the dictionary attribute that corresponds to `id_expr`.
+- If ClickHouse parses the attribute successfully in the [attribute's data type](../dicts/external_dicts_dict_structure.md#ext_dict_structure-attributes), functions return the value of the dictionary attribute that corresponds to `id_expr`.
 - If there is no requested `id_expr` in the dictionary then:
 
-    - `dictGet[Type]` returns the content of the `<null_value>` element which is specified for the attribute in the dictionary configuration.
+    - `dictGet[Type]` returns the content of the `<null_value>` element specified for the attribute in the dictionary configuration.
     - `dictGet[Type]OrDefault` returns the value passed as the `default_value_expr` parameter.
 
-ClickHouse throws an exception, if it cannot parse the value of the attribute or the value doesn't match the attribute data type.
+ClickHouse throws an exception if it cannot parse the value of the attribute or the value doesn't match the attribute data type.
 
 [Original article](https://clickhouse.yandex/docs/en/query_language/functions/ext_dict_functions/) <!--hide-->