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documentation fixes and description for replace_hash_partition() function
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README.md

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@@ -84,10 +84,9 @@ Done! Now it's time to setup your partitioning schemes.
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create_hash_partitions(relation REGCLASS,
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attribute TEXT,
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partitions_count INTEGER,
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partition_name TEXT DEFAULT NULL,
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partition_data BOOLEAN DEFAULT TRUE)
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```
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Performs HASH partitioning for `relation` by integer key `attribute`. The `partitions_count` parameter specifies the number of partitions to create; it cannot be changed afterwards. If `partition_data` is `true` then all the data will be automatically copied from the parent table to partitions. Note that data migration may took a while to finish and the table will be locked until transaction commits. See `partition_table_concurrently()` for a lock-free way to migrate data. Partition creation callback is invoked for each partition if set beforehand (see `set_part_init_callback()`).
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Performs HASH partitioning for `relation` by integer key `attribute`. The `partitions_count` parameter specifies the number of partitions to create; it cannot be changed afterwards. If `partition_data` is `true` then all the data will be automatically copied from the parent table to partitions. Note that data migration may took a while to finish and the table will be locked until transaction commits. See `partition_table_concurrently()` for a lock-free way to migrate data. Partition creation callback is invoked for each partition if set beforehand (see `set_init_callback()`).
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```plpgsql
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create_range_partitions(relation REGCLASS,
@@ -148,6 +147,14 @@ create_range_update_trigger(parent REGCLASS)
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Same as above, but for a RANGE-partitioned table.
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### Post-creation partition management
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```plpgsql
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replace_hash_partition(old_partition REGCLASS,
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new_partition REGCLASS,
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lock_parent BOOL DEFAULT TRUE)
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```
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Replaces specified partition of HASH-partitioned table with another table. The `lock_parent` parameter will prevent any INSERT/UPDATE/ALTER TABLE queries to parent table.
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```plpgsql
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split_range_partition(partition REGCLASS,
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split_value ANYELEMENT,

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