mirror of
https://github.com/GreptimeTeam/greptimedb.git
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d6c37778ae
* feat: table semantic layer information_schema view (Phase 3) Add `information_schema.table_semantics`, a queryable view over the table semantic layer. One row per table that carries at least one `greptime.semantic.*` option: the signal-agnostic keys (signal_type/source/pipeline/metadata_quality) are promoted to columns and the remaining signal-specific keys are folded into a `semantic_options` JSON string. Tables with no semantic key are excluded. Stacked on Phase 2. Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * chore: address PR review on table_semantics - fold JSON serialization failure into None instead of unwrap/panic - drop per-row Vec allocation in predicate eval; use a fixed array - align RFC view name with the shipped `table_semantics` Signed-off-by: Dennis Zhuang <killme2008@gmail.com> * chore: update results Signed-off-by: Dennis Zhuang <killme2008@gmail.com> --------- Signed-off-by: Dennis Zhuang <killme2008@gmail.com>
47 lines
1.2 KiB
SQL
47 lines
1.2 KiB
SQL
DESC TABLE information_schema.table_semantics;
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CREATE TABLE metrics_tagged (
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ts TIMESTAMP TIME INDEX,
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val DOUBLE,
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)
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WITH (
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'greptime.semantic.signal_type' = 'metric',
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'greptime.semantic.source' = 'opentelemetry',
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'greptime.semantic.pipeline' = 'greptime_metric_v1',
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'greptime.semantic.metric.metadata_quality' = 'declared',
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'greptime.semantic.metric.type' = 'counter',
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'greptime.semantic.metric.unit' = 'By'
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);
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CREATE TABLE traces_tagged (
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ts TIMESTAMP TIME INDEX,
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span_name STRING,
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)
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WITH (
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'greptime.semantic.signal_type' = 'trace',
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'greptime.semantic.source' = 'opentelemetry',
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'greptime.semantic.trace.conventions' = 'https://opentelemetry.io/schemas/1.27.0'
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);
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-- A table with no semantic options must not appear in the view.
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CREATE TABLE plain_table (
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ts TIMESTAMP TIME INDEX,
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val DOUBLE,
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);
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SELECT table_schema, table_name, signal_type, source, pipeline, metadata_quality, semantic_options
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FROM information_schema.table_semantics
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ORDER BY table_name;
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-- Predicate pushdown on a promoted column.
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SELECT table_name, signal_type
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FROM information_schema.table_semantics
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WHERE signal_type = 'metric'
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ORDER BY table_name;
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DROP TABLE metrics_tagged;
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DROP TABLE traces_tagged;
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DROP TABLE plain_table;
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