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Package com.gpudb.protocol

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Class GetRecordsRequest

java.lang.Object
com.gpudb.protocol.GetRecordsRequest
All Implemented Interfaces:
org.apache.avro.generic.GenericContainer, org.apache.avro.generic.IndexedRecord
public class GetRecordsRequest extends Object implements org.apache.avro.generic.IndexedRecord
A set of parameters for GPUdb.getRecords.

Retrieves records from a given table, optionally filtered by an expression and/or sorted by a column. This operation can be performed on tables and views. Records can be returned encoded as binary, json, or geojson.

This operation supports paging through the data via the offset and limit parameters. Note that when paging through a table, if the table (or the underlying table in case of a view) is updated (records are inserted, deleted or modified) the records retrieved may differ between calls based on the updates applied.

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    Constructor Details

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      GetRecordsRequest

      public GetRecordsRequest()
      Constructs a GetRecordsRequest object with default parameters.

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      GetRecordsRequest

      public GetRecordsRequest(String tableName, long offset, long limit, Map<String,String> options)
      Constructs a GetRecordsRequest object with the specified parameters.
      Parameters:
      tableName - Name of the table or view from which the records will be fetched, in [schema_name.]table_name format, using standard name resolution rules.
      offset - A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0. The minimum allowed value is 0. The maximum allowed value is MAX_INT.
      limit - A positive integer indicating the maximum number of results to be returned, or END_OF_SET (-9999) to indicate that the maximum number of results allowed by the server should be returned. The number of records returned will never exceed the server’s own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset and limit to request subsequent pages of results. The default value is -9999.
      options -
      • EXPRESSION: Filter expression to apply to the table.
      • FAST_INDEX_LOOKUP: Indicates if indexes should be used to perform the lookup for a given expression if possible. Only applicable if there is no sorting, the expression contains only equivalence comparisons based on existing tables indexes and the range of requested values is from [0 to END_OF_SET]. Supported values:The default value is TRUE.
      • SORT_BY: Column that the data should be sorted by. Empty by default (i.e. no sorting is applied).
      • SORT_ORDER: String indicating how the returned values should be sorted - ascending or descending. If sort_order is provided, sort_by has to be provided. Supported values:The default value is ASCENDING.
      The default value is an empty Map.

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      GetRecordsRequest

      public GetRecordsRequest(String tableName, long offset, long limit, String encoding, Map<String,String> options)
      Constructs a GetRecordsRequest object with the specified parameters.
      Parameters:
      tableName - Name of the table or view from which the records will be fetched, in [schema_name.]table_name format, using standard name resolution rules.
      offset - A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0. The minimum allowed value is 0. The maximum allowed value is MAX_INT.
      limit - A positive integer indicating the maximum number of results to be returned, or END_OF_SET (-9999) to indicate that the maximum number of results allowed by the server should be returned. The number of records returned will never exceed the server’s own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset and limit to request subsequent pages of results. The default value is -9999.
      encoding - Specifies the encoding for returned records; one of BINARY, JSON, or GEOJSON. Supported values:The default value is BINARY.
      options -
      • EXPRESSION: Filter expression to apply to the table.
      • FAST_INDEX_LOOKUP: Indicates if indexes should be used to perform the lookup for a given expression if possible. Only applicable if there is no sorting, the expression contains only equivalence comparisons based on existing tables indexes and the range of requested values is from [0 to END_OF_SET]. Supported values:The default value is TRUE.
      • SORT_BY: Column that the data should be sorted by. Empty by default (i.e. no sorting is applied).
      • SORT_ORDER: String indicating how the returned values should be sorted - ascending or descending. If sort_order is provided, sort_by has to be provided. Supported values:The default value is ASCENDING.
      The default value is an empty Map.

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    Method Details

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      getClassSchema

      public static org.apache.avro.Schema getClassSchema()
      This method supports the Avro framework and is not intended to be called directly by the user.
      Returns:
      The schema for the class.

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      getTableName

      public String getTableName()
      Name of the table or view from which the records will be fetched, in [schema_name.]table_name format, using standard name resolution rules.
      Returns:
      The current value of tableName.

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      setTableName

      public GetRecordsRequest setTableName(String tableName)
      Name of the table or view from which the records will be fetched, in [schema_name.]table_name format, using standard name resolution rules.
      Parameters:
      tableName - The new value for tableName.
      Returns:
      this to mimic the builder pattern.

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      getOffset

      public long getOffset()
      A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0. The minimum allowed value is 0. The maximum allowed value is MAX_INT.
      Returns:
      The current value of offset.

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      setOffset

      public GetRecordsRequest setOffset(long offset)
      A positive integer indicating the number of initial results to skip (this can be useful for paging through the results). The default value is 0. The minimum allowed value is 0. The maximum allowed value is MAX_INT.
      Parameters:
      offset - The new value for offset.
      Returns:
      this to mimic the builder pattern.

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      getLimit

      public long getLimit()
      A positive integer indicating the maximum number of results to be returned, or END_OF_SET (-9999) to indicate that the maximum number of results allowed by the server should be returned. The number of records returned will never exceed the server’s own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset and limit to request subsequent pages of results. The default value is -9999.
      Returns:
      The current value of limit.

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      setLimit

      public GetRecordsRequest setLimit(long limit)
      A positive integer indicating the maximum number of results to be returned, or END_OF_SET (-9999) to indicate that the maximum number of results allowed by the server should be returned. The number of records returned will never exceed the server’s own limit, defined by the max_get_records_size parameter in the server configuration. Use hasMoreRecords to see if more records exist in the result to be fetched, and offset and limit to request subsequent pages of results. The default value is -9999.
      Parameters:
      limit - The new value for limit.
      Returns:
      this to mimic the builder pattern.

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      getEncoding

      public String getEncoding()
      Specifies the encoding for returned records; one of BINARY, JSON, or GEOJSON. Supported values:The default value is BINARY.
      Returns:
      The current value of encoding.

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      setEncoding

      public GetRecordsRequest setEncoding(String encoding)
      Specifies the encoding for returned records; one of BINARY, JSON, or GEOJSON. Supported values:The default value is BINARY.
      Parameters:
      encoding - The new value for encoding.
      Returns:
      this to mimic the builder pattern.

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      getOptions

      public Map<String,String> getOptions()
      • EXPRESSION: Filter expression to apply to the table.
      • FAST_INDEX_LOOKUP: Indicates if indexes should be used to perform the lookup for a given expression if possible. Only applicable if there is no sorting, the expression contains only equivalence comparisons based on existing tables indexes and the range of requested values is from [0 to END_OF_SET]. Supported values:The default value is TRUE.
      • SORT_BY: Column that the data should be sorted by. Empty by default (i.e. no sorting is applied).
      • SORT_ORDER: String indicating how the returned values should be sorted - ascending or descending. If sort_order is provided, sort_by has to be provided. Supported values:The default value is ASCENDING.
      The default value is an empty Map.
      Returns:
      The current value of options.

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      setOptions

      public GetRecordsRequest setOptions(Map<String,String> options)
      • EXPRESSION: Filter expression to apply to the table.
      • FAST_INDEX_LOOKUP: Indicates if indexes should be used to perform the lookup for a given expression if possible. Only applicable if there is no sorting, the expression contains only equivalence comparisons based on existing tables indexes and the range of requested values is from [0 to END_OF_SET]. Supported values:The default value is TRUE.
      • SORT_BY: Column that the data should be sorted by. Empty by default (i.e. no sorting is applied).
      • SORT_ORDER: String indicating how the returned values should be sorted - ascending or descending. If sort_order is provided, sort_by has to be provided. Supported values:The default value is ASCENDING.
      The default value is an empty Map.
      Parameters:
      options - The new value for options.
      Returns:
      this to mimic the builder pattern.

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      getSchema

      public org.apache.avro.Schema getSchema()
      This method supports the Avro framework and is not intended to be called directly by the user.
      Specified by:
      getSchema in interface org.apache.avro.generic.GenericContainer
      Returns:
      The schema object describing this class.

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      get

      public Object get(int index)
      This method supports the Avro framework and is not intended to be called directly by the user.
      Specified by:
      get in interface org.apache.avro.generic.IndexedRecord
      Parameters:
      index - the position of the field to get
      Returns:
      value of the field with the given index.
      Throws:
      IndexOutOfBoundsException

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      put

      public void put(int index, Object value)
      This method supports the Avro framework and is not intended to be called directly by the user.
      Specified by:
      put in interface org.apache.avro.generic.IndexedRecord
      Parameters:
      index - the position of the field to set
      value - the value to set
      Throws:
      IndexOutOfBoundsException

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      equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object

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      toString

      public String toString()
      Overrides:
      toString in class Object

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      hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object