Class: Google::Apis::SpannerV1::PartialResultSet
- Inherits:
-
Object
- Object
- Google::Apis::SpannerV1::PartialResultSet
- Includes:
- Core::Hashable, Core::JsonObjectSupport
- Defined in:
- generated/google/apis/spanner_v1/classes.rb,
generated/google/apis/spanner_v1/representations.rb,
generated/google/apis/spanner_v1/representations.rb
Overview
Partial results from a streaming read or SQL query. Streaming reads and SQL queries better tolerate large result sets, large rows, and large values, but are a little trickier to consume.
Instance Attribute Summary collapse
-
#chunked_value ⇒ Boolean
(also: #chunked_value?)
If true, then the final value in values is chunked, and must be combined with more values from subsequent
PartialResultSet
s to obtain a complete field value. -
#metadata ⇒ Google::Apis::SpannerV1::ResultSetMetadata
Metadata about a ResultSet or PartialResultSet.
-
#resume_token ⇒ String
Streaming calls might be interrupted for a variety of reasons, such as TCP connection loss.
-
#stats ⇒ Google::Apis::SpannerV1::ResultSetStats
Additional statistics about a ResultSet or PartialResultSet.
-
#values ⇒ Array<Object>
A streamed result set consists of a stream of values, which might be split into many
PartialResultSet
messages to accommodate large rows and/or large values.
Instance Method Summary collapse
-
#initialize(**args) ⇒ PartialResultSet
constructor
A new instance of PartialResultSet.
-
#update!(**args) ⇒ Object
Update properties of this object.
Methods included from Core::JsonObjectSupport
Methods included from Core::Hashable
Constructor Details
#initialize(**args) ⇒ PartialResultSet
Returns a new instance of PartialResultSet
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1510 def initialize(**args) update!(**args) end |
Instance Attribute Details
#chunked_value ⇒ Boolean Also known as: chunked_value?
If true, then the final value in values is chunked, and must
be combined with more values from subsequent PartialResultSet
s
to obtain a complete field value.
Corresponds to the JSON property chunkedValue
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1424 def chunked_value @chunked_value end |
#metadata ⇒ Google::Apis::SpannerV1::ResultSetMetadata
Metadata about a ResultSet or PartialResultSet.
Corresponds to the JSON property metadata
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1430 def @metadata end |
#resume_token ⇒ String
Streaming calls might be interrupted for a variety of reasons, such
as TCP connection loss. If this occurs, the stream of results can
be resumed by re-sending the original request and including
resume_token
. Note that executing any other transaction in the
same session invalidates the token.
Corresponds to the JSON property resumeToken
NOTE: Values are automatically base64 encoded/decoded in the client library.
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1440 def resume_token @resume_token end |
#stats ⇒ Google::Apis::SpannerV1::ResultSetStats
Additional statistics about a ResultSet or PartialResultSet.
Corresponds to the JSON property stats
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1445 def stats @stats end |
#values ⇒ Array<Object>
A streamed result set consists of a stream of values, which might
be split into many PartialResultSet
messages to accommodate
large rows and/or large values. Every N complete values defines a
row, where N is equal to the number of entries in
metadata.row_type.fields.
Most values are encoded based on type as described
here.
It is possible that the last value in values is "chunked",
meaning that the rest of the value is sent in subsequent
PartialResultSet
(s). This is denoted by the chunked_value
field. Two or more chunked values can be merged to form a
complete value as follows:
bool/number/null
: cannot be chunkedstring
: concatenate the stringslist
: concatenate the lists. If the last element in a list is astring
,list
, orobject
, merge it with the first element in the next list by applying these rules recursively.object
: concatenate the (field name, field value) pairs. If a field name is duplicated, then apply these rules recursively to merge the field values. Some examples of merging: # Strings are concatenated. "foo", "bar" => "foobar" # Lists of non-strings are concatenated. [2, 3], [4] => [2, 3, 4] # Lists are concatenated, but the last and first elements are merged # because they are strings. ["a", "b"], ["c", "d"] => ["a", "bc", "d"] # Lists are concatenated, but the last and first elements are merged # because they are lists. Recursively, the last and first elements # of the inner lists are merged because they are strings. ["a", ["b", "c"]], [["d"], "e"] => ["a", ["b", "cd"], "e"] # Non-overlapping object fields are combined."a": "1"
,"b": "2"
=>"a": "1", "b": 2"
# Overlapping object fields are merged."a": "1"
,"a": "2"
=>"a": "12"
# Examples of merging objects containing lists of strings."a": ["1"]
,"a": ["2"]
=>"a": ["12"]
For a more complete example, suppose a streaming SQL query is yielding a result set whose rows contain a single string field. The followingPartialResultSet
s might be yielded:"metadata":
..."values": ["Hello", "W"] "chunked_value": true "resume_token": "Af65..."
"values": ["orl"] "chunked_value": true "resume_token": "Bqp2..."
"values": ["d"] "resume_token": "Zx1B..."
This sequence ofPartialResultSet
s encodes two rows, one containing the field value"Hello"
, and a second containing the field value"World" = "W" + "orl" + "d"
. Corresponds to the JSON propertyvalues
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1508 def values @values end |
Instance Method Details
#update!(**args) ⇒ Object
Update properties of this object
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# File 'generated/google/apis/spanner_v1/classes.rb', line 1515 def update!(**args) @chunked_value = args[:chunked_value] if args.key?(:chunked_value) @metadata = args[:metadata] if args.key?(:metadata) @resume_token = args[:resume_token] if args.key?(:resume_token) @stats = args[:stats] if args.key?(:stats) @values = args[:values] if args.key?(:values) end |