[DocDB] Pack inserted value

[spolitov]

Jira Link: DB-9716

Description

When inserting row with multiple values we send every column as a separate protobuf with complex structure and many other duplicated fields.
As result, during bulk load we spent significant amount of time parsing and analysing those protobufs.
Instead of that we could pack all values in postgres layer, and than insert them directly to docdb.

Issue Type

kind/bug

Warning: Please confirm that this issue does not contain any sensitive information

• I confirm this issue does not contain any sensitive information.

[spolitov]

Note, inserting 2 rows with 10 column values:

pgsql_write_batch {
  client: YQL_CLIENT_PGSQL
  stmt_id: 4560228640
  stmt_type: PGSQL_INSERT
  table_id: "00004000000030008000000000004000"
  schema_version: 0
  ybctid_column_value {
    value {
      binary_value: "H\200\001\202\271!"
    }
  }
  column_values {
    column_id: 11
    expr {
      value {
        int32_value: 47279295
      }
    }
  }
  column_values {
    column_id: 12
    expr {
      value {
        int32_value: 46652250
      }
    }
  }
  column_values {
    column_id: 13
    expr {
      value {
        int32_value: 79381197
      }
    }
  }
  column_values {
    column_id: 14
    expr {
      value {
        int32_value: 35803789
      }
    }
  }
  column_values {
    column_id: 15
    expr {
      value {
        int32_value: 92005163
      }
    }
  }
  column_values {
    column_id: 16
    expr {
      value {
        int32_value: 46730059
      }
    }
  }
  column_values {
    column_id: 17
    expr {
      value {
        int32_value: 30716606
      }
    }
  }
  column_values {
    column_id: 18
    expr {
      value {
        int32_value: 35252161
      }
    }
  }
  column_values {
    column_id: 19
    expr {
      value {
        int32_value: 93603689
      }
    }
  }
  column_values {
    column_id: 20
    expr {
      value {
        int32_value: 74867912
      }
    }
  }
  column_refs {
  }
  ysql_catalog_version: 1
  partition_key: "H\200\001\202\271!"
}
pgsql_write_batch {
  client: YQL_CLIENT_PGSQL
  stmt_id: 4635500832
  stmt_type: PGSQL_INSERT
  table_id: "00004000000030008000000000004000"
  schema_version: 0
  ybctid_column_value {
    value {
      binary_value: "H\200\001\202\272!"
    }
  }
  column_values {
    column_id: 11
    expr {
      value {
        int32_value: 10244035
      }
    }
  }
  column_values {
    column_id: 12
    expr {
      value {
        int32_value: 41177491
      }
    }
  }
  column_values {
    column_id: 13
    expr {
      value {
        int32_value: 10216579
      }
    }
  }
  column_values {
    column_id: 14
    expr {
      value {
        int32_value: 74231766
      }
    }
  }
  column_values {
    column_id: 15
    expr {
      value {
        int32_value: 65619415
      }
    }
  }
  column_values {
    column_id: 16
    expr {
      value {
        int32_value: 53048433
      }
    }
  }
  column_values {
    column_id: 17
    expr {
      value {
        int32_value: 81499950
      }
    }
  }
  column_values {
    column_id: 18
    expr {
      value {
        int32_value: 76332784
      }
    }
  }
  column_values {
    column_id: 19
    expr {
      value {
        int32_value: 58926211
      }
    }
  }
  column_values {
    column_id: 20
    expr {
      value {
        int32_value: 8846646
      }
    }
  }
  column_refs {
  }
  ysql_catalog_version: 1
  partition_key: "H\200\001\202\272!"
}