1. A computer-implemented method for deriving a posting list that contains posting records that identify documents that satisfy a logical combination of a plurality of terms of a query, comprising: for each term of the plurality of terms of the query being executed against a content store, generating a temporally ordered posting list having posting records that identify documents in the content store that satisfy the each term of the query, wherein: each posting record uniquely identifies a document by using a timestamp that is a document identifier; and within each temporally ordered posting list, posting records are listed in a pre-defined temporal order based on the timestamps that are used as document identifiers by the posting records; combining a first posting list and a second posting list of the temporally ordered posting lists by: selecting, based on the pre-defined temporal order of a first posting list having posting records that identify documents in the content store that satisfy a first term of the plurality of terms of the query, a posting record from the first posting list; selecting, based on the pre-defined temporal order of a second posting list having posting records that identify documents in the content store that satisfy a second term of the plurality of terms of the query, a posting record from the second posting list; performing a compare operation between the posting record from the first posting list and the posting record from the second posting list by comparing a first timestamp of the posting record from the first posting list with a second timestamp of the posting record from the second posting list; determining, based on the compare operation, whether there is a match between the posting record from the first posting list and the posting record from the second posting list; and in response to determining that there is a match, determining that the posting record from the first posting list or the posting record from the second posting list identifies a document that satisfies the query.
1. A computer-implemented method for deriving a posting list that contains posting records that identify documents that satisfy a logical combination of a plurality of terms of a query, comprising: for each term of the plurality of terms of the query being executed against a content store, generating a temporally ordered posting list having posting records that identify documents in the content store that satisfy the each term of the query, wherein: each posting record uniquely identifies a document by using a timestamp that is a document identifier; and within each temporally ordered posting list, posting records are listed in a pre-defined temporal order based on the timestamps that are used as document identifiers by the posting records; combining a first posting list and a second posting list of the temporally ordered posting lists by: selecting, based on the pre-defined temporal order of a first posting list having posting records that identify documents in the content store that satisfy a first term of the plurality of terms of the query, a posting record from the first posting list; selecting, based on the pre-defined temporal order of a second posting list having posting records that identify documents in the content store that satisfy a second term of the plurality of terms of the query, a posting record from the second posting list; performing a compare operation between the posting record from the first posting list and the posting record from the second posting list by comparing a first timestamp of the posting record from the first posting list with a second timestamp of the posting record from the second posting list; determining, based on the compare operation, whether there is a match between the posting record from the first posting list and the posting record from the second posting list; and in response to determining that there is a match, determining that the posting record from the first posting list or the posting record from the second posting list identifies a document that satisfies the query. 11. A method according to claim 1 , wherein said combining includes repeating the steps of selecting a posting record from the first posting list, selecting a posting record from the second posting list, performing a compare operation between posting records of the first and second posting lists, and determining whether there is a match, in date descending order of the first and second posting lists, from most recent to oldest, to determine which posting records satisfy the query.