العمل مع نوع Map في ClickHouse

Timestamp:          2025-12-26 00:00:45.759467000
TraceId:            0da128e6e3c01bc38b6b43a33e5fa522
SpanId:             3774f759424e4006
ParentSpanId:       2fdd1e5b66605098
SpanName:           orders receive
SpanKind:           SPAN_KIND_CONSUMER
ServiceName:        accountingservice
Duration:           5361
StatusCode:         STATUS_CODE_UNSET
ResourceAttributes: {"host.name":"f19476836e47","os.type":"linux","process.pid":"1","process.command_args":"[\"./accountingservice\"]","process.executable.path":"...
SpanAttributes:     {"network.transport":"tcp","messaging.destination.name":"orders","messaging.kafka.message.offset":"232260","messaging.message.body.size":"216"...

CREATE TABLE otel_traces
(
    Timestamp          DateTime64(9),
    TraceId            String,
    SpanId             String,
    ParentSpanId       String,
    SpanName           LowCardinality(String),
    SpanKind           LowCardinality(String),
    ServiceName        LowCardinality(String),
    Duration           UInt64,
    StatusCode         LowCardinality(String),
    ResourceAttributes Map(LowCardinality(String), String),
    SpanAttributes     Map(LowCardinality(String), String)
)
ENGINE = MergeTree()
ORDER BY (ServiceName, SpanName, toUnixTimestamp(Timestamp));

INSERT INTO otel_traces
SELECT * FROM file('~/data/data-otel-traces.csv', CSVWithNames);

SELECT count() FROM otel_traces;

SELECT
    ServiceName,
    SpanName,
    ResourceAttributes['host.name']             AS host,
    ResourceAttributes['k8s.pod.name']          AS pod,
    ResourceAttributes['deployment.environment'] AS env
FROM otel_traces
LIMIT 10;

SELECT
    Timestamp,
    SpanName,
    Duration / 1e6 AS duration_ms
FROM otel_traces
WHERE ResourceAttributes['service.name'] = 'cartservice'
ORDER BY Timestamp
LIMIT 10;

SELECT
    ServiceName,
    SpanName,
    mapContains(ResourceAttributes, 'k8s.node.name') AS has_node_info
FROM otel_traces
LIMIT 10;

SELECT DISTINCT arrayJoin(mapKeys(ResourceAttributes)) AS key
FROM otel_traces
ORDER BY key;

SELECT
    ServiceName,
    key,
    value
FROM otel_traces
ARRAY JOIN
    mapKeys(ResourceAttributes)  AS key,
    mapValues(ResourceAttributes) AS value
WHERE ServiceName = 'cartservice'
LIMIT 20;

SELECT
    ServiceName,
    mapFilter((k, v) -> k LIKE 'k8s.%', ResourceAttributes) AS k8s_attrs
FROM otel_traces
WHERE mapContains(ResourceAttributes, 'k8s.pod.name')
LIMIT 10;

SELECT
    Timestamp,
    ServiceName,
    SpanName,
    ResourceAttributes['host.name']    AS host,
    ResourceAttributes['k8s.pod.name'] AS pod,
    SpanAttributes['error.type']       AS error_type,
    SpanAttributes['error.message']    AS error_message
FROM otel_traces
WHERE StatusCode = 'STATUS_CODE_ERROR';

CREATE TABLE otel_http_status_counts
(
    Timestamp    DateTime,
    ServiceName  LowCardinality(String),
    StatusCounts Map(String, UInt64)
)
ENGINE = MergeTree()
ORDER BY (ServiceName, Timestamp);

INSERT INTO otel_http_status_counts VALUES
    ('2025-12-26 10:00:00', 'cart-service',      {'2xx': 150, '4xx': 12, '5xx': 3}),
    ('2025-12-26 10:01:00', 'cart-service',      {'2xx': 200, '4xx': 8,  '5xx': 1}),
    ('2025-12-26 10:00:00', 'inventory-service', {'2xx': 90,  '4xx': 5}),
    ('2025-12-26 10:01:00', 'inventory-service', {'2xx': 110, '4xx': 3,  '5xx': 2}),
    ('2025-12-26 10:00:00', 'payment-service',   {'2xx': 50,  '5xx': 10}),
    ('2025-12-26 10:01:00', 'payment-service',   {'2xx': 45,  '4xx': 2,  '5xx': 15});

SELECT
    ServiceName,
    sumMap(StatusCounts) AS total_by_status
FROM otel_http_status_counts
GROUP BY ServiceName;

SELECT
    ServiceName,
    avgMap(StatusCounts) AS avg_by_status,
    maxMap(StatusCounts) AS peak_by_status
FROM otel_http_status_counts
GROUP BY ServiceName;

SELECT
    ServiceName,
    sumMapIf(StatusCounts, StatusCounts['5xx'] > 0) AS totals_in_error_windows
FROM otel_http_status_counts
GROUP BY ServiceName;

ALTER TABLE otel_traces
    ADD COLUMN HostName String
    MATERIALIZED ResourceAttributes['host.name'];

ALTER TABLE otel_traces MATERIALIZE COLUMN HostName;