// Code generated by smithy-go-codegen DO NOT EDIT.

package dynamodb

import (
	"context"
	"fmt"
	awsmiddleware "github.com/aws/aws-sdk-go-v2/aws/middleware"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
	internalEndpointDiscovery "github.com/aws/aws-sdk-go-v2/service/internal/endpoint-discovery"
	"github.com/aws/smithy-go/middleware"
	smithyhttp "github.com/aws/smithy-go/transport/http"
)

// You must provide the name of the partition key attribute and a single value for
// that attribute. Query returns all items with that partition key value.
// Optionally, you can provide a sort key attribute and use a comparison operator
// to refine the search results.
//
// Use the KeyConditionExpression parameter to provide a specific value for the
// partition key. The Query operation will return all of the items from the table
// or index with that partition key value. You can optionally narrow the scope of
// the Query operation by specifying a sort key value and a comparison operator in
// KeyConditionExpression . To further refine the Query results, you can
// optionally provide a FilterExpression . A FilterExpression determines which
// items within the results should be returned to you. All of the other results are
// discarded.
//
// A Query operation always returns a result set. If no matching items are found,
// the result set will be empty. Queries that do not return results consume the
// minimum number of read capacity units for that type of read operation.
//
// DynamoDB calculates the number of read capacity units consumed based on item
// size, not on the amount of data that is returned to an application. The number
// of capacity units consumed will be the same whether you request all of the
// attributes (the default behavior) or just some of them (using a projection
// expression). The number will also be the same whether or not you use a
// FilterExpression .
//
// Query results are always sorted by the sort key value. If the data type of the
// sort key is Number, the results are returned in numeric order; otherwise, the
// results are returned in order of UTF-8 bytes. By default, the sort order is
// ascending. To reverse the order, set the ScanIndexForward parameter to false.
//
// A single Query operation will read up to the maximum number of items set (if
// using the Limit parameter) or a maximum of 1 MB of data and then apply any
// filtering to the results using FilterExpression . If LastEvaluatedKey is
// present in the response, you will need to paginate the result set. For more
// information, see [Paginating the Results]in the Amazon DynamoDB Developer Guide.
//
// FilterExpression is applied after a Query finishes, but before the results are
// returned. A FilterExpression cannot contain partition key or sort key
// attributes. You need to specify those attributes in the KeyConditionExpression .
//
// A Query operation can return an empty result set and a LastEvaluatedKey if all
// the items read for the page of results are filtered out.
//
// You can query a table, a local secondary index, or a global secondary index.
// For a query on a table or on a local secondary index, you can set the
// ConsistentRead parameter to true and obtain a strongly consistent result.
// Global secondary indexes support eventually consistent reads only, so do not
// specify ConsistentRead when querying a global secondary index.
//
// [Paginating the Results]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.html#Query.Pagination
func (c *Client) Query(ctx context.Context, params *QueryInput, optFns ...func(*Options)) (*QueryOutput, error) {
	if params == nil {
		params = &QueryInput{}
	}

	result, metadata, err := c.invokeOperation(ctx, "Query", params, optFns, c.addOperationQueryMiddlewares)
	if err != nil {
		return nil, err
	}

	out := result.(*QueryOutput)
	out.ResultMetadata = metadata
	return out, nil
}

// Represents the input of a Query operation.
type QueryInput struct {

	// The name of the table containing the requested items. You can also provide the
	// Amazon Resource Name (ARN) of the table in this parameter.
	//
	// This member is required.
	TableName *string

	// This is a legacy parameter. Use ProjectionExpression instead. For more
	// information, see [AttributesToGet]in the Amazon DynamoDB Developer Guide.
	//
	// [AttributesToGet]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.AttributesToGet.html
	AttributesToGet []string

	// This is a legacy parameter. Use FilterExpression instead. For more information,
	// see [ConditionalOperator]in the Amazon DynamoDB Developer Guide.
	//
	// [ConditionalOperator]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.ConditionalOperator.html
	ConditionalOperator types.ConditionalOperator

	// Determines the read consistency model: If set to true , then the operation uses
	// strongly consistent reads; otherwise, the operation uses eventually consistent
	// reads.
	//
	// Strongly consistent reads are not supported on global secondary indexes. If you
	// query a global secondary index with ConsistentRead set to true , you will
	// receive a ValidationException .
	ConsistentRead *bool

	// The primary key of the first item that this operation will evaluate. Use the
	// value that was returned for LastEvaluatedKey in the previous operation.
	//
	// The data type for ExclusiveStartKey must be String, Number, or Binary. No set
	// data types are allowed.
	ExclusiveStartKey map[string]types.AttributeValue

	// One or more substitution tokens for attribute names in an expression. The
	// following are some use cases for using ExpressionAttributeNames :
	//
	//   - To access an attribute whose name conflicts with a DynamoDB reserved word.
	//
	//   - To create a placeholder for repeating occurrences of an attribute name in
	//   an expression.
	//
	//   - To prevent special characters in an attribute name from being
	//   misinterpreted in an expression.
	//
	// Use the # character in an expression to dereference an attribute name. For
	// example, consider the following attribute name:
	//
	//   - Percentile
	//
	// The name of this attribute conflicts with a reserved word, so it cannot be used
	// directly in an expression. (For the complete list of reserved words, see [Reserved Words]in the
	// Amazon DynamoDB Developer Guide). To work around this, you could specify the
	// following for ExpressionAttributeNames :
	//
	//   - {"#P":"Percentile"}
	//
	// You could then use this substitution in an expression, as in this example:
	//
	//   - #P = :val
	//
	// Tokens that begin with the : character are expression attribute values, which
	// are placeholders for the actual value at runtime.
	//
	// For more information on expression attribute names, see [Specifying Item Attributes] in the Amazon DynamoDB
	// Developer Guide.
	//
	// [Reserved Words]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html
	// [Specifying Item Attributes]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html
	ExpressionAttributeNames map[string]string

	// One or more values that can be substituted in an expression.
	//
	// Use the : (colon) character in an expression to dereference an attribute value.
	// For example, suppose that you wanted to check whether the value of the
	// ProductStatus attribute was one of the following:
	//
	//     Available | Backordered | Discontinued
	//
	// You would first need to specify ExpressionAttributeValues as follows:
	//
	//     { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"},
	//     ":disc":{"S":"Discontinued"} }
	//
	// You could then use these values in an expression, such as this:
	//
	//     ProductStatus IN (:avail, :back, :disc)
	//
	// For more information on expression attribute values, see [Specifying Conditions] in the Amazon
	// DynamoDB Developer Guide.
	//
	// [Specifying Conditions]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.SpecifyingConditions.html
	ExpressionAttributeValues map[string]types.AttributeValue

	// A string that contains conditions that DynamoDB applies after the Query
	// operation, but before the data is returned to you. Items that do not satisfy the
	// FilterExpression criteria are not returned.
	//
	// A FilterExpression does not allow key attributes. You cannot define a filter
	// expression based on a partition key or a sort key.
	//
	// A FilterExpression is applied after the items have already been read; the
	// process of filtering does not consume any additional read capacity units.
	//
	// For more information, see [Filter Expressions] in the Amazon DynamoDB Developer Guide.
	//
	// [Filter Expressions]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Query.FilterExpression.html
	FilterExpression *string

	// The name of an index to query. This index can be any local secondary index or
	// global secondary index on the table. Note that if you use the IndexName
	// parameter, you must also provide TableName.
	IndexName *string

	// The condition that specifies the key values for items to be retrieved by the
	// Query action.
	//
	// The condition must perform an equality test on a single partition key value.
	//
	// The condition can optionally perform one of several comparison tests on a
	// single sort key value. This allows Query to retrieve one item with a given
	// partition key value and sort key value, or several items that have the same
	// partition key value but different sort key values.
	//
	// The partition key equality test is required, and must be specified in the
	// following format:
	//
	// partitionKeyName = :partitionkeyval
	//
	// If you also want to provide a condition for the sort key, it must be combined
	// using AND with the condition for the sort key. Following is an example, using
	// the = comparison operator for the sort key:
	//
	//     partitionKeyName
	//
	//     =
	//
	//     :partitionkeyval
	//
	//     AND
	//
	//     sortKeyName
	//
	//     =
	//
	//     :sortkeyval
	//
	// Valid comparisons for the sort key condition are as follows:
	//
	//   - sortKeyName = :sortkeyval - true if the sort key value is equal to
	//   :sortkeyval .
	//
	//   - sortKeyName < :sortkeyval - true if the sort key value is less than
	//   :sortkeyval .
	//
	//   - sortKeyName <= :sortkeyval - true if the sort key value is less than or
	//   equal to :sortkeyval .
	//
	//   - sortKeyName > :sortkeyval - true if the sort key value is greater than
	//   :sortkeyval .
	//
	//   - sortKeyName >= :sortkeyval - true if the sort key value is greater than or
	//   equal to :sortkeyval .
	//
	//   - sortKeyName BETWEEN :sortkeyval1 AND :sortkeyval2 - true if the sort key
	//   value is greater than or equal to :sortkeyval1 , and less than or equal to
	//   :sortkeyval2 .
	//
	//   - begins_with ( sortKeyName , :sortkeyval ) - true if the sort key value
	//   begins with a particular operand. (You cannot use this function with a sort key
	//   that is of type Number.) Note that the function name begins_with is
	//   case-sensitive.
	//
	// Use the ExpressionAttributeValues parameter to replace tokens such as
	// :partitionval and :sortval with actual values at runtime.
	//
	// You can optionally use the ExpressionAttributeNames parameter to replace the
	// names of the partition key and sort key with placeholder tokens. This option
	// might be necessary if an attribute name conflicts with a DynamoDB reserved word.
	// For example, the following KeyConditionExpression parameter causes an error
	// because Size is a reserved word:
	//
	//   - Size = :myval
	//
	// To work around this, define a placeholder (such a #S ) to represent the
	// attribute name Size. KeyConditionExpression then is as follows:
	//
	//   - #S = :myval
	//
	// For a list of reserved words, see [Reserved Words] in the Amazon DynamoDB Developer Guide.
	//
	// For more information on ExpressionAttributeNames and ExpressionAttributeValues ,
	// see [Using Placeholders for Attribute Names and Values]in the Amazon DynamoDB Developer Guide.
	//
	// [Reserved Words]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html
	// [Using Placeholders for Attribute Names and Values]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ExpressionPlaceholders.html
	KeyConditionExpression *string

	// This is a legacy parameter. Use KeyConditionExpression instead. For more
	// information, see [KeyConditions]in the Amazon DynamoDB Developer Guide.
	//
	// [KeyConditions]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.KeyConditions.html
	KeyConditions map[string]types.Condition

	// The maximum number of items to evaluate (not necessarily the number of matching
	// items). If DynamoDB processes the number of items up to the limit while
	// processing the results, it stops the operation and returns the matching values
	// up to that point, and a key in LastEvaluatedKey to apply in a subsequent
	// operation, so that you can pick up where you left off. Also, if the processed
	// dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the
	// operation and returns the matching values up to the limit, and a key in
	// LastEvaluatedKey to apply in a subsequent operation to continue the operation.
	// For more information, see [Query and Scan]in the Amazon DynamoDB Developer Guide.
	//
	// [Query and Scan]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/QueryAndScan.html
	Limit *int32

	// A string that identifies one or more attributes to retrieve from the table.
	// These attributes can include scalars, sets, or elements of a JSON document. The
	// attributes in the expression must be separated by commas.
	//
	// If no attribute names are specified, then all attributes will be returned. If
	// any of the requested attributes are not found, they will not appear in the
	// result.
	//
	// For more information, see [Accessing Item Attributes] in the Amazon DynamoDB Developer Guide.
	//
	// [Accessing Item Attributes]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html
	ProjectionExpression *string

	// This is a legacy parameter. Use FilterExpression instead. For more information,
	// see [QueryFilter]in the Amazon DynamoDB Developer Guide.
	//
	// [QueryFilter]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.QueryFilter.html
	QueryFilter map[string]types.Condition

	// Determines the level of detail about either provisioned or on-demand throughput
	// consumption that is returned in the response:
	//
	//   - INDEXES - The response includes the aggregate ConsumedCapacity for the
	//   operation, together with ConsumedCapacity for each table and secondary index
	//   that was accessed.
	//
	// Note that some operations, such as GetItem and BatchGetItem , do not access any
	//   indexes at all. In these cases, specifying INDEXES will only return
	//   ConsumedCapacity information for table(s).
	//
	//   - TOTAL - The response includes only the aggregate ConsumedCapacity for the
	//   operation.
	//
	//   - NONE - No ConsumedCapacity details are included in the response.
	ReturnConsumedCapacity types.ReturnConsumedCapacity

	// Specifies the order for index traversal: If true (default), the traversal is
	// performed in ascending order; if false , the traversal is performed in
	// descending order.
	//
	// Items with the same partition key value are stored in sorted order by sort key.
	// If the sort key data type is Number, the results are stored in numeric order.
	// For type String, the results are stored in order of UTF-8 bytes. For type
	// Binary, DynamoDB treats each byte of the binary data as unsigned.
	//
	// If ScanIndexForward is true , DynamoDB returns the results in the order in which
	// they are stored (by sort key value). This is the default behavior. If
	// ScanIndexForward is false , DynamoDB reads the results in reverse order by sort
	// key value, and then returns the results to the client.
	ScanIndexForward *bool

	// The attributes to be returned in the result. You can retrieve all item
	// attributes, specific item attributes, the count of matching items, or in the
	// case of an index, some or all of the attributes projected into the index.
	//
	//   - ALL_ATTRIBUTES - Returns all of the item attributes from the specified table
	//   or index. If you query a local secondary index, then for each matching item in
	//   the index, DynamoDB fetches the entire item from the parent table. If the index
	//   is configured to project all item attributes, then all of the data can be
	//   obtained from the local secondary index, and no fetching is required.
	//
	//   - ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves
	//   all attributes that have been projected into the index. If the index is
	//   configured to project all attributes, this return value is equivalent to
	//   specifying ALL_ATTRIBUTES .
	//
	//   - COUNT - Returns the number of matching items, rather than the matching items
	//   themselves. Note that this uses the same quantity of read capacity units as
	//   getting the items, and is subject to the same item size calculations.
	//
	//   - SPECIFIC_ATTRIBUTES - Returns only the attributes listed in
	//   ProjectionExpression . This return value is equivalent to specifying
	//   ProjectionExpression without specifying any value for Select .
	//
	// If you query or scan a local secondary index and request only attributes that
	//   are projected into that index, the operation will read only the index and not
	//   the table. If any of the requested attributes are not projected into the local
	//   secondary index, DynamoDB fetches each of these attributes from the parent
	//   table. This extra fetching incurs additional throughput cost and latency.
	//
	// If you query or scan a global secondary index, you can only request attributes
	//   that are projected into the index. Global secondary index queries cannot fetch
	//   attributes from the parent table.
	//
	// If neither Select nor ProjectionExpression are specified, DynamoDB defaults to
	// ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when
	// accessing an index. You cannot use both Select and ProjectionExpression
	// together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES
	// . (This usage is equivalent to specifying ProjectionExpression without any
	// value for Select .)
	//
	// If you use the ProjectionExpression parameter, then the value for Select can
	// only be SPECIFIC_ATTRIBUTES . Any other value for Select will return an error.
	Select types.Select

	noSmithyDocumentSerde
}

// Represents the output of a Query operation.
type QueryOutput struct {

	// The capacity units consumed by the Query operation. The data returned includes
	// the total provisioned throughput consumed, along with statistics for the table
	// and any indexes involved in the operation. ConsumedCapacity is only returned if
	// the ReturnConsumedCapacity parameter was specified. For more information, see [Capacity unit consumption for read operations]
	// in the Amazon DynamoDB Developer Guide.
	//
	// [Capacity unit consumption for read operations]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/read-write-operations.html#read-operation-consumption
	ConsumedCapacity *types.ConsumedCapacity

	// The number of items in the response.
	//
	// If you used a QueryFilter in the request, then Count is the number of items
	// returned after the filter was applied, and ScannedCount is the number of
	// matching items before the filter was applied.
	//
	// If you did not use a filter in the request, then Count and ScannedCount are the
	// same.
	Count int32

	// An array of item attributes that match the query criteria. Each element in this
	// array consists of an attribute name and the value for that attribute.
	Items []map[string]types.AttributeValue

	// The primary key of the item where the operation stopped, inclusive of the
	// previous result set. Use this value to start a new operation, excluding this
	// value in the new request.
	//
	// If LastEvaluatedKey is empty, then the "last page" of results has been
	// processed and there is no more data to be retrieved.
	//
	// If LastEvaluatedKey is not empty, it does not necessarily mean that there is
	// more data in the result set. The only way to know when you have reached the end
	// of the result set is when LastEvaluatedKey is empty.
	LastEvaluatedKey map[string]types.AttributeValue

	// The number of items evaluated, before any QueryFilter is applied. A high
	// ScannedCount value with few, or no, Count results indicates an inefficient Query
	// operation. For more information, see [Count and ScannedCount]in the Amazon DynamoDB Developer Guide.
	//
	// If you did not use a filter in the request, then ScannedCount is the same as
	// Count .
	//
	// [Count and ScannedCount]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Scan.html#Scan.Count
	ScannedCount int32

	// Metadata pertaining to the operation's result.
	ResultMetadata middleware.Metadata

	noSmithyDocumentSerde
}

func (c *Client) addOperationQueryMiddlewares(stack *middleware.Stack, options Options) (err error) {
	if err := stack.Serialize.Add(&setOperationInputMiddleware{}, middleware.After); err != nil {
		return err
	}
	err = stack.Serialize.Add(&awsAwsjson10_serializeOpQuery{}, middleware.After)
	if err != nil {
		return err
	}
	err = stack.Deserialize.Add(&awsAwsjson10_deserializeOpQuery{}, middleware.After)
	if err != nil {
		return err
	}
	if err := addProtocolFinalizerMiddlewares(stack, options, "Query"); err != nil {
		return fmt.Errorf("add protocol finalizers: %v", err)
	}

	if err = addlegacyEndpointContextSetter(stack, options); err != nil {
		return err
	}
	if err = addSetLoggerMiddleware(stack, options); err != nil {
		return err
	}
	if err = addClientRequestID(stack); err != nil {
		return err
	}
	if err = addComputeContentLength(stack); err != nil {
		return err
	}
	if err = addResolveEndpointMiddleware(stack, options); err != nil {
		return err
	}
	if err = addComputePayloadSHA256(stack); err != nil {
		return err
	}
	if err = addRetry(stack, options); err != nil {
		return err
	}
	if err = addRawResponseToMetadata(stack); err != nil {
		return err
	}
	if err = addRecordResponseTiming(stack); err != nil {
		return err
	}
	if err = addSpanRetryLoop(stack, options); err != nil {
		return err
	}
	if err = addClientUserAgent(stack, options); err != nil {
		return err
	}
	if err = smithyhttp.AddErrorCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = smithyhttp.AddCloseResponseBodyMiddleware(stack); err != nil {
		return err
	}
	if err = addOpQueryDiscoverEndpointMiddleware(stack, options, c); err != nil {
		return err
	}
	if err = addSetLegacyContextSigningOptionsMiddleware(stack); err != nil {
		return err
	}
	if err = addTimeOffsetBuild(stack, c); err != nil {
		return err
	}
	if err = addUserAgentRetryMode(stack, options); err != nil {
		return err
	}
	if err = addOpQueryValidationMiddleware(stack); err != nil {
		return err
	}
	if err = stack.Initialize.Add(newServiceMetadataMiddleware_opQuery(options.Region), middleware.Before); err != nil {
		return err
	}
	if err = addRecursionDetection(stack); err != nil {
		return err
	}
	if err = addRequestIDRetrieverMiddleware(stack); err != nil {
		return err
	}
	if err = addResponseErrorMiddleware(stack); err != nil {
		return err
	}
	if err = addValidateResponseChecksum(stack, options); err != nil {
		return err
	}
	if err = addAcceptEncodingGzip(stack, options); err != nil {
		return err
	}
	if err = addRequestResponseLogging(stack, options); err != nil {
		return err
	}
	if err = addDisableHTTPSMiddleware(stack, options); err != nil {
		return err
	}
	if err = addSpanInitializeStart(stack); err != nil {
		return err
	}
	if err = addSpanInitializeEnd(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestStart(stack); err != nil {
		return err
	}
	if err = addSpanBuildRequestEnd(stack); err != nil {
		return err
	}
	return nil
}

// QueryPaginatorOptions is the paginator options for Query
type QueryPaginatorOptions struct {
	// The maximum number of items to evaluate (not necessarily the number of matching
	// items). If DynamoDB processes the number of items up to the limit while
	// processing the results, it stops the operation and returns the matching values
	// up to that point, and a key in LastEvaluatedKey to apply in a subsequent
	// operation, so that you can pick up where you left off. Also, if the processed
	// dataset size exceeds 1 MB before DynamoDB reaches this limit, it stops the
	// operation and returns the matching values up to the limit, and a key in
	// LastEvaluatedKey to apply in a subsequent operation to continue the operation.
	// For more information, see [Query and Scan]in the Amazon DynamoDB Developer Guide.
	//
	// [Query and Scan]: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/QueryAndScan.html
	Limit int32
}

// QueryPaginator is a paginator for Query
type QueryPaginator struct {
	options   QueryPaginatorOptions
	client    QueryAPIClient
	params    *QueryInput
	nextToken map[string]types.AttributeValue
	firstPage bool
}

// NewQueryPaginator returns a new QueryPaginator
func NewQueryPaginator(client QueryAPIClient, params *QueryInput, optFns ...func(*QueryPaginatorOptions)) *QueryPaginator {
	if params == nil {
		params = &QueryInput{}
	}

	options := QueryPaginatorOptions{}
	if params.Limit != nil {
		options.Limit = *params.Limit
	}

	for _, fn := range optFns {
		fn(&options)
	}

	return &QueryPaginator{
		options:   options,
		client:    client,
		params:    params,
		firstPage: true,
		nextToken: params.ExclusiveStartKey,
	}
}

// HasMorePages returns a boolean indicating whether more pages are available
func (p *QueryPaginator) HasMorePages() bool {
	return p.firstPage || p.nextToken != nil
}

// NextPage retrieves the next Query page.
func (p *QueryPaginator) NextPage(ctx context.Context, optFns ...func(*Options)) (*QueryOutput, error) {
	if !p.HasMorePages() {
		return nil, fmt.Errorf("no more pages available")
	}

	params := *p.params
	params.ExclusiveStartKey = p.nextToken

	var limit *int32
	if p.options.Limit > 0 {
		limit = &p.options.Limit
	}
	params.Limit = limit

	optFns = append([]func(*Options){
		addIsPaginatorUserAgent,
	}, optFns...)
	result, err := p.client.Query(ctx, &params, optFns...)
	if err != nil {
		return nil, err
	}
	p.firstPage = false

	prevToken := p.nextToken
	p.nextToken = result.LastEvaluatedKey

	_ = prevToken

	return result, nil
}

func addOpQueryDiscoverEndpointMiddleware(stack *middleware.Stack, o Options, c *Client) error {
	return stack.Finalize.Insert(&internalEndpointDiscovery.DiscoverEndpoint{
		Options: []func(*internalEndpointDiscovery.DiscoverEndpointOptions){
			func(opt *internalEndpointDiscovery.DiscoverEndpointOptions) {
				opt.DisableHTTPS = o.EndpointOptions.DisableHTTPS
				opt.Logger = o.Logger
			},
		},
		DiscoverOperation:            c.fetchOpQueryDiscoverEndpoint,
		EndpointDiscoveryEnableState: o.EndpointDiscovery.EnableEndpointDiscovery,
		EndpointDiscoveryRequired:    false,
		Region:                       o.Region,
	}, "ResolveEndpointV2", middleware.After)
}

func (c *Client) fetchOpQueryDiscoverEndpoint(ctx context.Context, region string, optFns ...func(*internalEndpointDiscovery.DiscoverEndpointOptions)) (internalEndpointDiscovery.WeightedAddress, error) {
	input := getOperationInput(ctx)
	in, ok := input.(*QueryInput)
	if !ok {
		return internalEndpointDiscovery.WeightedAddress{}, fmt.Errorf("unknown input type %T", input)
	}
	_ = in

	identifierMap := make(map[string]string, 0)
	identifierMap["sdk#Region"] = region

	key := fmt.Sprintf("DynamoDB.%v", identifierMap)

	if v, ok := c.endpointCache.Get(key); ok {
		return v, nil
	}

	discoveryOperationInput := &DescribeEndpointsInput{}

	opt := internalEndpointDiscovery.DiscoverEndpointOptions{}
	for _, fn := range optFns {
		fn(&opt)
	}

	go c.handleEndpointDiscoveryFromService(ctx, discoveryOperationInput, region, key, opt)
	return internalEndpointDiscovery.WeightedAddress{}, nil
}

// QueryAPIClient is a client that implements the Query operation.
type QueryAPIClient interface {
	Query(context.Context, *QueryInput, ...func(*Options)) (*QueryOutput, error)
}

var _ QueryAPIClient = (*Client)(nil)

func newServiceMetadataMiddleware_opQuery(region string) *awsmiddleware.RegisterServiceMetadata {
	return &awsmiddleware.RegisterServiceMetadata{
		Region:        region,
		ServiceID:     ServiceID,
		OperationName: "Query",
	}
}
