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There is a bug in the JSON pretty-printer:
"tree": {
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"merges": [
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{
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"index_merge": {
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"tree": {
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"ranges": ["c1(1)0"]
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},
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"tree": {
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"ranges": ["c2(1)1"]
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}
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}
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},
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"ranges": "c2(1)1", <--- this member was not intended to be printed
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{
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"index_merge": {
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"tree": {
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"ranges": ["c1(1)2"]
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},
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"tree": {
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"ranges": ["c2(1)3"]
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}
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}
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}
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]
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}
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As far as I know, there is no way to observe the bug for a user.
Json_writer is only used to produce ANALYZE|EXPLAIN FORMAT=JSON output. These documents have particular structure, and it doesn't allow to hit a bug.
I've hit the bug by using Json_writer from extra debugging code.
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